Original subtitles

-Nothing changed. -We're back at the HQ.

Something feels different today.

-It really does. -There must be a different theme.

-For sure. -What could it be?

-Hi, guys. -Welcome.

-Hi. -You made it.

I heard our best agent arrived first.

Oh, stop.

-Look who's here. -Hey.

Hi, everyone.

-Welcome. -Hello.

Handsome as always.

-And you're beautiful as always. -Gosh.

Do-hoon and I were wondering if we should officially be a duo.

Should we do it?

-Oh, because you were tied up together? -Exactly. So?

-What do you think? -My wrists are still bruised.

-They still hurt. -Look at this.

This is driving me nuts.

I guess there's no way out once you're tied like this.

I feel like we have a thing going. Man, my wrists.

It's like we're a real team with this outfit on.

For sure.

-Like a real team. -I love it.

I wonder why we're all wearing jumpsuits.

Are they somehow related to the theme?

-That's what I was just wondering. -Same here.

-They're very comfortable though. -Is everyone else wearing boots?

-Yes. -Just in case.

I knew it.

-You never know what might happen. -I'm starting to get the idea.

You know what I'm thinking?

It's in case our clothes get dirty.

-I thought the same thing. -Right? Are we going inside something?

My stylist freaked out last time.

Yeah, you put your hand in that hole.

-Look at his face. -We should've done rock, paper, scissors.

The way I see it, there will be that much mud all over the floor.

-And we'll have to crawl. -Like this?

On our backs too.

I think it'll get physical today.

You still haven't told us what the four of you were up to.

-What? -Remember?

You didn't tell us what happened while we were locked up.

-Right. -In that wagon.

Wait, they peeled these chestnuts.

-Found it. -Really?

You're halfway there.

Could we move those out of the way and go through there?

This is it!

-Safflower seed powder, check. -Great.

Just watch the show when it's out.

Then I'd have to wait six months!

Why can't we know what happened on our own show?

-You've got to tell us. -I know, right?

Greetings.

That was so scary.

Here is the next mission assigned to you by XIN.

An abnormal level of X-Electric Waves

has been detected in the deep seas of Mindanao,

where we discovered the submarine, the Midas.

-Submarine! -It is likely

that the waves are being emitted from the submarine.

The submarine, the Midas,

is a civilian deep-sea research vessel

operated by the Korean Research Council of Deep Sea Creatures,

which has received financial support in recent years

from Star & Stone Industry, a multinational corporation.

On the Midas

are six crew members

conducting research on deep sea creatures.

-"Jang Man-gyeong"? -The Midas

is a state-of-the-art submarine

equipped with cutting-edge AI technology

that scans for the crew members' bio-signals every hour

to monitor their safety.

Our reports show that

the bio-signals of five passengers out of six have disappeared.

The last remaining bio-signal also seems erratic,

and it is unclear whether they are alive.

-We should hurry then. -In addition,

it appears that the submarine's AI system has been shut down.

Your mission for today

is two-fold.

First,

find out whether the six crew members are still alive

and investigate what happened.

Got it.

Second,

secure the external memory devices

located inthe submarine's central computer.

Okay, memory devices.

Eight of them?

They must be important.

Collect the two-way radio and the camera for collecting evidence

and enter the Teleport Chamber.

Okay.

You will be given a total ofsix hours

to carry out the mission.

You must finish your mission within the time limit

-Okay. -and return to the Chamber.

-Six hours. -As this mission

will be conducted in the deep seas...

-Deep seas? -...you must take extra caution.

-The secrecy of our organization -I'm scared.

must not be exposed.

You don't think it'll flood, do you?

-What do we do then? -It's totally going to.

If you get caught in the process,

XIN will,

regardless of your safety,

deny any involvement with this mission.

With that, I wish you good luck.

-It's open! -Here we go again.

Let's make sure to take pictures.

-A lot of them. -Yeah, I'll do it.

-Here you go. -I'll take photos.

-Okay. -Here's your radio.

-Hold on to them. -Thank you.

Make sure you have yours.

-They were really important last time. -They really were.

Did you all know that I was in the Navy?

-It's true. -Really?

He was in the Navy.

But don't ask me anything.

I know nothing.

-That was almost reassuring. -Can you swim?

Of course.

Wait, can someone clarify this for me?

So first, we need to check whether the five are still alive.

-Six. -Six people.

-But they said one of them is still alive. -We don't know if he is.

-So six. -We still have a signal.

So we check for all six of them.

But do we have to rescue them?

-We'll have to if they're alive. -Of course.

Are you going to do this again?

-"Let's go!" -I don't think I can lift anyone today.

-Is that a bag? -What's this?

I think it's for the memory devices.

-I see. -Should I wear it?

-I got it. -You sure?

-No, I'll wear it. -It's light.

-I'm the team porter. -Yes?

Are you?

Need this? Karina has it.

-Need that? Karina has it. -"I got it."

She had everything.

It looks good on you.

-Does it? -Yeah.

-Should we bring it in before we go? -I'm glad we have a bag this time.

Off to the deep seas.

Agents of Mystery!

-Let's go! -Let's go!

Let's head for the deep seas.

-Check this out. -I hope it won't get flooded.

All the names of the missing people have something to do with the deep sea.

-I see. -One sounds like "periscope."

This one is "deep seas," and this one is "research."

Keep an eye on the time, Do-hoon.

-Got it. -Let's hit the button.

-Here I go. -Okay.

-I'm excited to go to the deep seas. -Me too.

-I love water. -Really?

We're moving!

-I can't get used to this. -I forgot about this.

We're off to the submarine. I'm so excited.

There's an element of fantasy to submarines, so that was very exciting.

I did serve in the Navy, but I know nothing about submarines.

I've never even been near one.

When you hear the words "deep seas," there's a sense of mystery.

So I was kind of scared.

I'm not scared of many things,

but the deep sea is one of the few things that I find terrifying.

Just imagine all the unidentified deep sea creatures lurking beneath

like weird jellyfish or something.

I wasn't really scared at first.

I thought the worst we'd see would be an octopus or something.

-That was a long ride. -It was.

We had to travel far.

Are we inside the submarine now?

I think so.

We're inside it.

-All right. -I'm sweating already.

Do we open this?

AGENTS OF MYSTERY

Open it.

It's a straight-up submarine.

-There's water! -There's water!

-Oh my god. -Is this water?

I think we have a leak.

-This is crazy. -No way. Something definitely went down.

This is insane.

When we entered the submarine,

there was water on the floor.

That's when I understood why they had us wear boots.

The water only went up to our heels,

but it felt like it would rise to our ankles at any moment.

I had a bad feeling about the water.

It felt empty.

Like there was no one around.

Where are all the crew members?

-Wow. -Are you serious?

Are submarines supposed to have water in them?

-I don't think so. -There's the oxygen level.

-It's at the "caution" level. -Look at it.

It's at 17%.

"Central computer power off."

"Emergency protocol activated."

"Causes and solutions of low oxygen level."

"Cause one, oxygen concentrator valve malfunction."

"Solution one, raise the oxygen level by adjusting the valve."

-We have to do this first. -Okay.

"Cause two, oxygen generator power off."

"Solution two, turn on the oxygen generator."

"Cause three, central computer error."

"Solution three, reboot the central computer."

If the oxygen level drops to 0% from 17%,

-we'll all die. -That's true.

We need to fix this first then.

The oxygen level is low and will keep dropping.

To accomplish our mission and solve this mystery,

we need to get the oxygen level back up.

In the last mission, I didn't quite know what I was doing.

But I made up my mind to focus better this time.

As I looked around, I noticed an open vent with a rope hanging out of it.

I think we should take a picture of that.

-Why is there a rope? -What is that?

Someone either came in or left using this rope.

A rope?

I thought we had to climb up the rope.

There's no way I can do that.

I should have worked out more.

-Can anyone here even climb up this rope? -No, we can't.

-How did they do it? -I know, right?

Can you pull it out?

-Should I try? -Go for it.

Do you think we could climb up?

-I don't think so. -No?

What's going on?

I think...

What the heck?

What the heck?

Hye-ri!

Look at her!

That really got me.

Do-hoon asked if he should pull the rope,

so we all told him to try.

And as soon as he did, water came pouring down.

Hye-ri!

Look at her!

-Eun-ji! -What the heck?

-What happened to you? -Eun-ji!

What is this?

Guys.

-What happened? -Are you okay?

What just happened, Hye-ri?

You're kidding me right now.

I'm soaked to my underwear.

But Do-hoon is totally dry.

-What just happened? -Dude!

I didn't get a drop of water on me.

I just dodged it.

I quickly avoided all the water using my impressive reflexes.

I was the only one who got wet.

-Are you okay? -I'm completely soaked.

How did you manage that?

How are you the only one who got wet?

-Look at her back. -What?

-Turn around. -She's soaked.

-Wait. -Are you at a water park or something?

I need to get a picture of you.

This is hilarious.

I'm soaked to my underwear.

-Oh no. -I thought I'd have to climb up there

with John and Do-hoon.

-I didn't expect this. -Why did you tell him to pull it?

No, listen.

Someone would have tried it.

Yes, absolutely.

Are you serious?

-You'd think this is a water park. -That's so true.

This was funny though.

I was worried the water would keep going.

-That was scary. -Tell me about it.

I'm glad that was it.

Can you open it?

Wait, you might let more water in!

-Wait. -What is it?

-I think we can go up here. -You're right.

Should we?

That one's stuck, isn't it?

I don't think this is it.

Let's climb up.

Are you sure you can do it?

-Can you? -I don't think you should.

-I think I can. -No, you shouldn't.

Actually, Karina.

It might be dangerous, so you should go first.

-I'll go first. -I guess I should.

I'll see what's up there.

Let us know if you need anything.

-Okay. -We'll get it up to you.

-Wait. -What is it?

There's something here.

-What is it? -Some kind of puzzle.

Tell us what it looks like.

I think it's a CPU.

-CPU? -It looks like a destroyed CPU.

I'll go up now.

We should all go together.

-Should we? -Let's go.

-There's not much to do here anyway. -Exactly.

Careful, Eun-ji.

Be careful.

The CPU on the second floor was completely destroyed.

There was nothing I could do.

Look at this.

There's something here.

Look.

Doesn't it look like someone destroyed it?

-Yes. -What is this?

-Hey! -Oh my gosh!

-My gosh, Eun-ji. -Hye-ri!

-Yes? -Take your time.

I'm kind of scared.

Oh no.

-Are you scared? -Yes.

What do you want to do?

Do you want to wait down here?

I'm actually scared.

-It's all right. -Help her up, Do-hoon.

Help her up.

Everyone should come see this.

I'll climb up with this.

I'm sweating.

See if we have to bring anything, Eun-ji.

-On it. -Let me know right away.

-Okay. -Take a look, Hye-ri.

I think we have to put these pieces together.

-Should we wait for the others? -Just a moment.

Will we need the rope?

Should we bring it?

You can come up now, Yong-jin.

-Should we bring the rope? -The rope?

No, I don't think we'll need that.

Okay.

There's also a picture of the crew members.

I'll keep it just in case.

-Not that I think we'll need it. -What about this?

I think this will come in handy later on.

And this.

-Are you coming up? -Yes.

-These pieces rotate. -Okay.

I think we need to

-put the CPU pieces together. -Oh, like this.

-The lines are connected. -They are.

There was some sort of puzzle with six pieces,

but parts of the pieces seemed to be chipped off.

So it made me wonder

whether we had to assemble the pieces and somehow connect them.

-Right? -I think so.

What could this be?

What do you think happened to it?

A lighter?

-I don't think you can force them on. -No.

And they don't really fit together.

Could this just be broken?

-I think so. -It seems like it.

I think so too.

Wait a minute.

I think I found something.

-What is it? -Did you see a hex driver, Yong-jin?

Are you talking about this?

-It's hexagonal. -That's it.

Could you toss it down?

-Don't catch it. -Careful.

What did you find?

There's something that looks like a fuse box here,

just like the one up there.

Really?

I'll go check it out.

I don't know if it's because I was locked up with him, but...

-Did you bond? -Naturally, yeah.

Do-hoon scares easier than you think.

There might be something here.

-Okay, guys. -We found it.

-What is it? -Listen.

It's the completed version of the one upstairs.

-Right. -I think we have to make them match.

-Got it. -I'll go down and take a picture.

-Yeah, exactly. -I'll be back.

-Great idea. -Yeah.

-You have the completed version? -Yeah.

Should I try pressing the button?

-Yes. -Go for it.

Hold on.

Let's see if it opens.

Still locked.

What a great find.

Did Do-hoon find it?

-Yes. -Right on, Do-hoon.

You're amazing.

You just keep getting better.

You're the best.

Is there a button?

Down here?

-There is. -Yeah, there is.

Does it do anything?

-No. -It won't open.

Is this what it has to look like?

-I think so. -I see.

Do those pieces move?

Try moving them.

-These move too. -Really?

Maybe we just have to solve that one.

You might be right.

We need to do this one then.

Is there a pattern?

-Should the lines connect? -I think so.

I think the lines have to connect.

-Exactly. -Okay.

Try to line them up with the two middle pieces.

That's right.

Connecting the middle pieces first makes things easier

because you can see where they should line up.

You're right. We'll try that.

I think this part should go up.

Do that first.

-You should be able to line them all up. -Okay.

I got it.

-Think of it as one big piece. -Okay.

The middle pieces connect now.

-The middle ones are connected. -Okay.

You're so smart, Hye-ri.

I barely did anything.

I still think you are.

-But this doesn't fit. -No, it doesn't.

-Got it. -This is it.

These ones connect.

-Okay. -Let's do this one now.

-That's the last one, right? -The bottom one.

-I think we got it. -Should I press the button?

-We're pressing the button! -Here we go!

Okay.

-It's working! -We did it!

-The light's on! -Really?

Press it.

-Did you get it open? -It opened!

What?

What is it?

What's wrong?

-What is it? -Come on!

-What's wrong? -Hold on.

-What? -Damn it.

-What? -What the heck?

It's a dead body.

What?

Who is it?

-His head is... -One of the crew.

His head is missing.

-What now? -It's just gone.

I was not expecting to see a dead body right there.

Definitely not one with a missing head.

Since the crew deals with high pressure,

I thought some sort of accident might've happened.

-We should go down. -Come on down.

Does that door open?

The light's red. It won't open.

-It won't open then. -Okay.

It has to turn green.

Come down carefully.

We need to find out who it is.

-Can you help Hye-ri down, Do-hoon? -Okay.

Step on the yellow tape, Hye-ri.

Okay.

It's Han Hae-joong.

On the Midas

are six crew members.

It's Han Hae-joong.

HAN HAE-JOONG, 35 ENGINEER

That really scared me.

We were told at the beginning

that they lost the bio-signals of five crew members.

We thought that those five might not be alive anymore.

What has to happen for a corpse to look like this?

I know.

At first, I thought something exploded and blew his head right off.

But then I thought maybe there's some sort of monster in here.

And then I thought maybe they got into a fight.

-Look at this. -Oh no.

It's blood.

-But... -How?

Should I keep it just in case?

I got it.

There's nothing else.

-I think that's it. -Is that it?

-I think so. -Poor guy.

What do we do with the body?

Should we put it aside?

Should we move it out?

It'll be heavy.

Wait, I'll hold his legs.

Look at all the blood.

It's either of the two.

Either it was a monster,

or something exploded while he was operating something.

-His head is completely gone. -Exactly.

Now we know where one of the six members went.

-We know what happened to Han Hae-joong. -Yeah.

-Should we go in? -Okay.

Let's go.

-Careful. -It's slippery here.

Watch your step, everyone.

This is the oxygen generator.

-You're right. -Yeah.

-We found it, John. -Okay.

What's that? Jeez!

-What is it? -It came from outside.

-It did. -Did something explode?

Watch your step.

-What the heck? -What?

The oxygen level went down.

-It did. -It went down?

It's now at 16%.

It says we're at the "danger" level.

So what exploded?

What was that sound?

I definitely heard a loud boom.

Maybe the low oxygen level caused the valve to blow or something.

-What do we do? -We need to adjust the valve

to raise the oxygen level.

-We're at the "danger" level. -Yes.

-Maybe that caused the sound. -Possibly.

-This is the valve right here. -Okay.

-"Oxygen level valve." -What does it say?

"The oxygen level has a significant effect

on the health of the crew and the safety of the submarine."

"Do not operate unless the oxygen level is abnormal."

-It's abnormal. -It's definitely abnormal.

Turning the valve clockwise raises the oxygen level

and counterclockwise lowers it.

-We need to get it up. -Should we try?

-Yeah. -Clockwise.

We just have to... Got it.

I have a bad feeling about this.

I almost had a heart attack.

Air started blowing from all directions.

We should be careful about what we touch today.

The oxygen level hasn't changed.

Should we close it back up?

If it's not this,

then we should turn the oxygen generator on.

You're right.

-This wasn't it. -We need to do that.

-Oxygen concentrator... -I think this is what we need to turn on.

But isn't it on already?

Isn't this the oxygen generator?

The oxygen level went down.

-Even lower? -It's constantly getting lower.

-This is not good. -What do we do?

Could this blueprint be useful?

I saw the blueprint and there was a cockpit, laboratory,

meeting room, and engine room.

Since we were in the engine room,

I thought that we had to get the oxygen level up

by turning a valve or whatever else needed to be done.

You were in the Navy. Don't you know this stuff?

-They didn't teach me this stuff. -They didn't?

-"Power." -I'm just as lost as you are.

Power...

Here's the power switch. Will this reboot it?

It says "panel lights."

This is for the lights.

-I'm scared to touch anything. -Same here.

Should I flip this switch?

-It says "main control." -Flip it.

-I'm so scared. -All the lights...

We all became cowards.

Your neck is all stiff.

What?

-Nothing is happening. -Did it go down?

Really?

My heart.

Should we reboot the central computer first?

-But the computer isn't here. -That's the problem.

-"Cycle start"? -"Cycle start."

I think this light is supposed to be green.

How do we turn on the oxygen generator?

Hold on.

-Hold on. -What is it?

-This isn't it. -Okay.

We need to adjust the valve.

-The valve? -The valve?

We need to adjust the oxygen generator's valve

to raise the oxygen level.

-But that's what this is. -This is the oxygen generator.

-Should I turn it? -Why not turn it more?

Let's just stick together for five seconds.

-I'll turn it. -Okay.

-Come here, Hye-ri. -Okay.

-My heart is racing. -I'm so scared.

-Is that as far as it goes? -But the causes...

Should we keep turning it?

I don't think so.

I thought the emitted gas would raise the oxygen level,

but it actually did the opposite.

The problem wasn't in the valve.

We had to look for something else.

There are three possible causes of this problem.

-It's not the first one. -Okay.

The second one says to turn on the oxygen concentrator if it's off,

-but it's already on. -Right.

-So we should go after number three. -The central computer.

-I thought the same thing. -Where's the central computer?

The central computer won't look like our regular computers.

It'll be one of those things

that you'd find in a server room of a building.

We need to get to the central computer to solve the oxygen problem.

-Okay. -Should we go then?

-It's this way. -This door has to open.

We have to open this door first.

Is this the blueprint?

-Yes, we found it on the wall. -Okay.

-We're on the first floor. -So this is the engine room.

That's right.

We started in the dock, then went to the docking room,

-and now the engine room. -Okay.

-Next up is the lab. -Right.

-It might be there. -If there's a computer,

-it's either in the lab or the cockpit. -Or in the cockpit?

-Either way, we need to open this. -We do.

Could we open it with this ID?

HAN HAE-JOONG, ENGINEER

Good idea.

-That's right. -The ID could work.

-What if we tapped the card? -That could work.

-But where? -There's nothing to tap it on.

-You find anything? -No.

Wait, is this another fuse box?

Let's try opening it.

-Is it the same thing as before? -With the screwdriver?

So that's how you opened it earlier.

Could the sensor be inside?

-It might be. -Possibly.

Good thing I brought this.

-Do-hoon. -Yes?

I'm impressed.

-Am I doing okay? -Totally.

-It's the same thing. -Come on.

-We have to do this again. -It's another one.

-Just like we did before? -Yeah.

Let's see.

-Do you need to see the picture? -Sure.

This doesn't seem right.

-That part doesn't connect. -No, it doesn't.

-We got it. -I'm scared again.

Wait, step back.

-You too, Hye-ri. -Okay.

-So this is the lab. -That's right.

-Let's go. -Okay.

It's the lab for sure.

Is this where we reboot the computer?

-I don't know. -It doesn't look like

the central computer is in here.

Look at this.

There's a strange creature here.

I saw a bed as soon as I entered the lab.

And there was this strange, sticky, and transparent liquid on the bed.

It looked sticky and very unpleasant.

There were also fish and shrimp being grown in the lab.

It was obvious something suspicious was going on.

It kind of creeped me out.

-This is just like... -They've been doing research.

Maybe a monster was created during the research,

-and it went haywire. -I think so too.

-Like in Alien? -And it ran away. Yes, like in Alien.

How many are there? Five?

-Six. -Six.

Maybe one of them betrayed the rest.

And they conducted strange experiments on the other members.

That could be it because they told us one could still be alive.

The bio-signalsof five out of six passengers have disappeared.

The last remaining bio-signal also seems erratic,

and it is unclear whether they are alive.

-One thing's for sure. -It's not him?

It's not Han Hae-joong.

There's only one lab coat.

It belongs to Sim Hye-jung!

-That's right. -You mean Sim Hye-sung?

Right, Sim Hye-sung.

At that moment,

I had a feeling that this was a case of murder among the crew members.

There's a laptop here.

We found a laptop!

Wait, John.

This laptop isn't the central computer, is it?

-Probably not. -I don't think so.

-Do we need a password? -It might give us a clue.

-"Only authorized personnel..." -"Only authorized personnel

may access this laptop."

Try typing random words.

It might give us a hint.

INCORRECT PASSWORD. PLEASE TRY AGAIN.

-"Level R"? -It says "Level R..."

The password hint is "Access Level R or higher required."

-That's what it says. -Level R?

-Level R? -Level R?

-Is that like a rank? -I think so.

-Level R? -My heart is racing.

-"Access Level R or higher." -Wait a minute.

Let's look around.

-Let's look for clues. -Okay.

Another one of these.

-We might have to do experiments. -Maybe.

Wait, there's a video camera.

Is there anything on it?

I'll check.

There was a video camera next to the laptop,

but the screen was shattered.

I'll take the camera's memory card out.

Yeah, let's hold on to it.

-I think that's what the laptop is for. -That's right.

Put the card in here.

We need to solve our oxygen problem first.

-You're right. -Right?

We need the central computer.

-Ultimately, yes. -That's right.

We better hurry.

Should we just open the door and move on for now?

-Is this our priority right now? -I think so.

We need Access Level R or higher.

This ID has an S on it.

-He's only Level S. -Where?

-That means... -He's Level S.

So we need to find someone who's Level R.

If it's Level R or higher, doesn't that include Level S?

-Does it? -"Any illegal access attempts

will be subject to punishment by law."

"Please report any such behavior

to the Korea Research Council of Deep Sea Creatures."

"All reports will remain anonymous, and informants' identities will be..."

-I found it. -No way.

-What is it? -I knew it.

-What is it? -I knew it.

You know what I mean?

-I just got goosebumps. -I knew it.

-What happened? -It's the ID we found.

There's a puzzle on the back.

-I got goosebumps. -I knew it.

The ID was in a plastic card holder with personal information on the front.

So I broke the holder,

thinking there might be something on the back.

And we found a clue on the back of the card.

The Wagon Brothers are on a roll.

I'm proud of Yong-jin.

But he's Level S, not R.

Well, S is higher than R.

-I think it'll work. -It just has to be higher than Level R.

Let's solve this.

How did you break it?

-He just snapped it. -I just looked and saw the access level.

-You just wanted to break it? -That's not what I meant.

-It had the level on it. -Did you have a hunch?

-I knew there had to be something. -He had a hunch.

-No way. -I was actually expecting a barcode.

Could we think of this as a barcode?

-I think so. -Right?

This could be the puzzle itself,

or it could be a key for something else.

I wondered what the letters could mean.

-I have a question, John. -Yeah?

Are there any words you can make with these letters?

Do certain letters make up words for any items

that we could look for?

-I don't see any. -Let me write them down.

-Did you get anything? -I'll try solving one.

-Hold on. -Let's see.

Could it be an optical illusion?

F, Y...

Is U between F and Y?

Could you check the keyboard, Hye-ri?

-Right, the keyboard. -It's not.

-No? -No.

How could we solve this?

-Let's try this. -What?

G is between F and H.

Between U and J...

One, two, three, four, five, six...

That's not it.

Keep working on that. I'll try to look for other clues.

Jeez, come on!

-What's wrong? -I should've known.

I thought it was chicken breast, but it's a mouse.

That scared me.

I saw that there were frozen and vacuum-packed mice.

There were also fruit flies and other small creatures.

I thought they may have been food for the test subject they kept here

for some kind of unethical research.

-So they did do experiments here. -Right.

-That's for sure. -Seems like it.

It would help if we knew any rules or codes.

-That would be so helpful. -Do these turn into Korean?

I really think this barcode means something.

-It just... -Stands out, doesn't it?

Exactly.

I think this barcode will show us the rules to solve the puzzle.

-Perhaps there's something in here. -Are there any barcode scanners?

Or anything that looks like a barcode.

A barcode scanner?

Barcode?

What could it mean?

What could it be?

What do we do?

Here's a first aid kit.

We should definitely take this.

Look. What do you think?

-Should we? -Yes, just in case.

Okay.

Someone might get hurt.

Okay, let's take it.

-Are you a maximalist? -Totally.

So am I.

Should we take some of these too?

-What are they? -I'm guessing

they are testing kits for the virus they're researching here.

-Should I carry the bag? -No, I got it.

My job here is to be a porter.

I'm in charge of carrying the backpack.

This is leading nowhere.

-Okay, so... -Is there anything else?

I have a feeling we'll have to use this barcode.

-Maybe we need clues from somewhere else. -Maybe.

Try opening that box.

-Let's open it. -Okay, I'll try.

Good job, Do-hoon.

I thought you were a repairman.

I'll grab a notebook.

Although...

-I have paper. -The bag is getting heavier.

-Let me carry it. -It's okay.

Karina.

The bag is getting heavier and heavier.

-Do you know what's in here? -Come on.

Just in case?

-I'll carry it. -It's a first aid kit.

-It's all right. -I got it.

-I'll let you know if it gets too heavy. -All right.

We really need to get the oxygen level back up.

-We should hurry. -It's not looking good.

It's at 14% now.

14%?

Here we go again.

-Another one of these. -We just have to do the same thing.

Next is the meeting room.

Is this right?

No, the lines don't connect.

Do the one on the left.

The two on the right are done.

-We got it. -The light's on.

-Careful. -Let's go!

Let's go.

It's open.

What's that?

What's wrong?

-There's a person. -Where?

-Where? -Down there, to the right.

Something's leaking.

This is crazy.

JI YOUNG-KOO

Why are all their heads missing?

Maybe a monster ate all their heads.

-Maybe it eats brains. -Maybe.

That must be it.

It could be a monster.

That means it's above us.

-I found it. -Where?

It was covered in blood.

It's a bloodbath out here.

There's the secret video.

-Hey, Joo-hyoung! -Hey.

It entered the body through the respiratory tract.

Is the creature living inside him?

It's moving around up there.

We have to be careful.

Danger is right around the corner now.

I'm terrified. I'm genuinely scared.

We need to go up to the second floor.

We have to go inside the vent.

I really don't want to go.

I'll go.

Subtitle translation by: Ji-hun Lee