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(This is a work of fiction. The characters, places, organizations, events, and backgrounds are entirely fictional.)

(Child and animal actors were filmed with the consent and supervision of their guardians, in compliance with safety guidelines.)

(Lee Soo-hyuk, Arin)

(and Lee Da-hee)

"S LINE"

"S LINE" (A red line connecting people who have had a sexual relationship)

-How could this happen? -Hurry...

Hurry... Teacher, we're going to be late.

Let's go... Let's go.

Let's go first, this isn't working.

-We're leaving! -Good luck, Teacher!

-We're going now! -You can do it!

Kids, be careful. You could get hurt.

I'm going to be late.

Teacher.

This.

Oh, my memory.

Thank you, Jun-seon.

Hey.

Class president.

What's for lunch today?

How should I know?

Also,

you're not even in my class. Why do you keep calling me class president?

What's the big deal?

You've been the class president since middle school anyway.

So, what's for lunch today?

So annoying.

Come on, tell me.

-Tell me. -I don't know.

Tell me!

You must be a psycho.

Get lost, you moron.

You get lost.

Why aren't you answering?

What is it now?

Where are we going this weekend?

Wherever you want to go.

Okay.

Last year, the rate of sexual experience among teenagers was 5.9%.

According to the National Statistics Office, the registered population for that age group...

...is a total of 3,096,947 people.

The number of teenagers who have actually had sexual intercourse...

...is estimated to be over 170,000.

Only 170,000?

(Animal Kingdom)

(Blocked Number: I can also see the world you see. Come to Ark High School.)

(That bitch Kang Seon-ah. The crazy witch Kang Seon-ah.)

Hey, you drew it too beautifully.

Make it uglier.

(I've liked you for a long time, though you don't know... Gross.)

-It's a good drawing. -Does it look like her?

That's a bit harsh.

It's not wrong though.

Seon-ah is mad. What do we do?

'To Ji-won.'

'Hello.'

'Although you don't know me...'

'...I've liked you for a long time.'

Damn it.

Give it back.

Class.

Class...

Seon-ah.

No matter what, violence is wrong.

If you just charge in like that, I can't stand up for you.

I'm going to kill her.

What?

Teacher, I want to go home now.

(Profile: Oh Jeong-min)

(Crime Scene Photos)

Sir, you've gone too far.

What did I do now?

No, you sent me to that guy's house alone.

Why were you so late?

I almost died.

I had a real emergency. Sorry.

And now I have to write a report because I fired my gun.

Ugh, firing your gun to save someone means you have to write a report.

Not firing it to protect a criminal's rights gets you blasted by the media.

It sucks either way.

But why are you looking at this again?

Didn't we already catch the killer?

Something feels off.

What feels off?

I can't figure out why he killed them.

Weren't they all women he was involved with?

He's probably just one of those psychos...

...who develops a weird inferiority complex about women he's broken up with.

Plus, he has a record of dating violence.

Because of that, he got kicked out of high school and started teaching at an academy.

That was last year.

Why now, of all times?

Hmm...

Because of the heat?

That guy kept talking about salvation.

Are you sure he's not religious?

Right. According to people around him...

...he was the furthest thing from a religious person.

A math teacher and religion...

The two don't really mix.

Is it the line?

Shit.

What the hell is this?

Kang Seon-ah, have you eaten?

Hey, where are you going in the middle of the night?

What's going on?

What is all this?

Kang Seon-ah, get in the car.

I'll take you to school.

Damn it.

Hurry up.

I said we're running out of time.

-This is driving me crazy. -This one?

-I've been at it all day. -Hurry up and come here.

What?

So the homeroom teacher has never been in a relationship.

Wait a minute, Seon-mi.

If that's the case, the last one to finish eating pays.

Ugh, so gross.

(Faculty Lounge)

This is huge.

Everyone, quiet down.

We have a new transfer student in our class today.

Her name is Shin Hyeon-seub.

Hyeon-seub, please introduce yourself.

Well then,

please get along well with your classmates.

If you have any questions, just ask the class president, Jun-seon.

You can take that empty seat over there.

Go ahead and sit down.

Get ready for fifth period.

-Okay... -Damn it.

Why isn't she talking? Is she mute?

(Math - Oh Jeong-min) (Jeonil College Prep Academy)

(Math - Oh Jeong-min)

The glasses...

(Wanseong Apt. 204 Attempted Murder Case - Seized Items from Oh Jeong-min)

Glasses... glasses...

I'm sorry.

What's the rush?

It's nothing.

Want to meet up after this?

I'll text you.

(Main Office - Education Planning Dept.)

(Lee Gyu-jin)

Can I help you?

I'm Detective Han Ji-wook from Ark Police Station.

There's something I'd like to ask you about.

You're Seon-ah's father, right?

I'm not her father, I'm her uncle.

That explains it.

You look very young.

Seon-ah's been having a rough time lately.

I'm sure you're aware.

I've been too busy, I didn't notice...

I'm sorry. I haven't been looking after her properly.

Don't say that.

But I'm not here today about Seon-ah.

I'm here to investigate something related to the murder case.

The murder case?

Yes. You know about the serial killer who was caught...

...over at Wanseong Apartment, right?

I don't live around here, so...

Well then, do you know a Mr. Oh Jeong-min?

He was a math teacher at Ark High School until last year.

I know Mr. Oh.

Don't tell me...

Are you saying Mr. Oh is dead?

Yes, but he wasn't the victim.

He was the perpetrator.

How could that be?

Are you saying Mr. Oh killed someone?

So I wanted to ask...

...this might sound a bit strange...

...did Oh Jeong-min normally wear glasses?

Glasses?

Yes.

Well...

I don't think I've ever seen him wear glasses.

Are you on something?

I don't have any money for you, so stop bothering me.

What's this? You've got a death wish now?

Damn, you've got no shame left, do you?

Shouldn't you be the one who's ashamed?

What?

Why should I be ashamed?

Tell me. What should I be ashamed of?

Stop.

What's with this now?

Are you guys a team?

What now? Damn it, you gonna jump?

No. We jump together.

Damn it, let me go!

Grab on to me! Shit!

Promise me you won't mess with us again.

I get it... Let go!

Crazy bitch.

Hye-yeong, are you okay?

Why are you sticking your nose in this?

Did anyone ask for your help?

Are you... still mad at me?

Why would I be mad at you?

Just stay out of my business from now on.

What are you doing? Get over here.

Want to see Seon-ah before you go?

Class is about to end.

No, it's fine.

She'd probably freak out if she knew I came to school.

Well, if I remember anything else, I'll let you know.

Okay.

By the way, this...

What?

How could this...

Damn it, what's he doing here?

Excuse me.

I heard this man comes here often. Do you recognize him?

I do. Is there a problem?

I'm Detective Han Ji-wook from Ark Police Station.

I'm here to investigate something.

This gentleman is one of our regulars.

Though he hasn't been coming around as much lately.

Was there anything unusual about him?

Well...

He would always drink quietly by himself and then leave.

But at some point, he started talking to himself a lot.

I thought he was just drunk.

But when he left, he always seemed perfectly sober.

Talking to himself?

He was constantly reciting numbers.

Like he was counting something.

1, 2, 3...

Like that.

Eventually, he got into a fight with another customer.

25, 26, 27.

No, start over...

1, 2...

Sir, that man is a bit strange.

Sir, is there something you want to say to me?

Wow, there are so fucking many.

What is he talking about now?

This guy must be sick.

Oh, and also that person...

...I think he was wearing glasses.

Thank you.

Who even carries a notebook these days?

So cute.

Wait a minute...

Can you pick up girls with a notebook?

But why did you pretend not to know me at school earlier?

With so many students passing by, how was I supposed to greet you?

Honestly.

(Miseong Motel)

(Kang Seon-ah sent a photo)

Crazy bitch.

What's wrong?

It's nothing.

Is it because you've been so tired lately?

You look so worn out these days, right?

Really? I don't think so.

Teacher.

If people find out I'm dating you...

...what would you do?

Well, what should I do?

I'd have to run away with our Hye-yeong.

What else could I do?

(Miseong Motel)

(You seem to forget we're minors. The Korean teacher gets punished, but I don't. You idiot.)

You seem to forget we're minors.

The Korean teacher gets punished, but I don't. You idiot.

Did you see the news yesterday?

A female teacher at Jeongil High had a sexual relationship with a male student.

My goodness, what is the world coming to...

Although the teacher is also at fault...

...I really don't understand what kids these days are thinking.

Teacher, you're very pretty.

Don't you have male students hitting on you?

My goodness, why would you say something like that? That's ridiculous.

Teacher, that's sexual harassment.

Oh, is it?

I'm sorry.

No, it's okay.

Then it's okay to say it to a man, right?

Our Korean teacher is very handsome, too.

Be careful.

If you're not careful, you could get entangled with a strange student and get into trouble.

An old man like me...

...is it possible for kids to be interested in me?

Let's go.

(Message from Unknown Sender)

Teacher.

Aren't you going to class?

I... I have to go...

(Prepare 20 million won in cash)

Would 20 million won be enough for a security deposit?

I'm not sure.

I really want to escape this utterly tiresome house.

You're moving out?

Why?

No reason, I'm just fed up.

This house, this neighborhood...

...and the people here.

I don't have a family anyway.

I'll have to live alone someday.

Isn't the detective your family?

Hey.

How is an uncle family?

He doesn't care about me anyway.

But at least you have him.

What about you?

Do you think your mom is still alive?

I don't know.

That's true.

If she were alive, she probably would have contacted you.

Take your time, what's the rush?

Ugh, fine.

-Geez... -So good.

Why are you eating so much?

Mom, he called me a pig again.

-Honestly, why do you two always have to fight during meals? -The photos I took on my trip.

Isn't it cute?

This one is after I fell in the water.

Hey, Kim Hye-yeong.

Are you just going to keep sleeping in class and running to the bathroom?

Am I?

Your attitude is really hopeless.

What is it with you now? What do you want?

Tell me.

What was that about just now? Were you deliberately yelling at me?

Do you know something?

Like someone is making threats?

Ah.

So you got the photo.

Kang Seon-ah did it.

Kang Seon-ah?

Kang Seon-ah from your class?

How does she know about us? Did you tell her?

How would I know?

I'm a victim too.

Why are you freaking out on me? Damn it.

Kim Hye-yeong!

Is that any way to talk to a teacher?

Teacher...

...I am so sorry.

I'll be returning to class now.

Idiot.

How could Kang Seon-ah...

But how on earth did she find out?

What photo? Where was it taken?

That's why I told you to be careful.

What do you think you're doing?

-What's wrong? -You're asking me what's wrong?

Can you really say that right now? Tell me.

Did you break up with me just to mess around with trash like that?

Were we even dating?

Hey!

Are you saying I'm the one who told?

You must have, or else how would I have gotten the photo?

It wasn't me! It must have been you, think about it!

-Was it me? -I did think about it, that's why I'm saying this!

-I got the photo this morning. -Hey, wasn't it you?

Keep your voice down, this is a school.

-Hey, maybe you let it slip when you were drunk? -Am I crazy?

These glasses.

What about them?

Did you wear glasses before?

Ah.

My eyesight just got worse.

What are you doing? Stop it.

You can see something when you wear these glasses, can't you?

What nonsense are you talking about?

The red lines.

You too...

...can see them?

Well then,

how many lines are above my head right now?

One.

Choi Da-hye has five, Kim Hye-yeong has two.

One of which is with the Korean teacher.

Choi I-seul has more than ten.

The gym teacher and the math teacher are having an affair.

Should I tell you more?

How did you...

Where did you get these glasses?

I just found them.

It's true.

They were left in my locker.

Give them back.

These are dangerous.

What's so dangerous about a pair of glasses?

You know about the incident at your neighbor's house, right?

That man was also wearing these glasses.

He saw the S-Lines.

S-Lines?

So they have a name.

So what?

I'm not curious at all...

...who they originally belonged to.

They're mine.

Teacher.

Yes?

You have a student named Seon-ah in your class, right? Kang Seon-ah.

Yes, is something wrong with Seon-ah?

How is she?

Her attitude in class has been a bit off lately.

Really?

She hasn't had any problems recently.

Should I have a talk with her?

Is that so?

No, that's fine. I'll talk to her.

You're looking at my S-Line, aren't you?

No, I'm not.

But do you know how to get rid of S-Lines?

Well...

Does the other person just have to die?

Those glasses...

...are you going to keep them with you?

Of course.

I'm going to let them know...

...just how worthless they all are.

(Prepare 20 million won in cash)

(Mind Your Head)

Is this your first time?

No.

Is it okay?

(Korean Teacher: I've prepared the 20 million won. Come to the school rooftop at midnight tonight.)

Who is it?

My sponsor.

Where do you want to go?

What did you say?

Just...

...want to go sing?

(Life Four-Cut) [Photo Booth]

Like this.

What are you doing?

I don't think this one's working.

Let's go check over there.

-Ah... -This is super strong.

-What the heck is this? -I'm serious.

This is mine.

So you shut your mouth, too.

-The picture came out really well. -What is this? The expression is...

But the one on top came out really nice.

Wow...

Ah, damn it.

What's wrong?

This one's good.

What the hell?

Excuse me.

Did you happen to see a pair of glasses over there just now?

Hey.

It was you, wasn't it?

You're the one who took them, right?

What are you talking about?

The glasses.

My glasses are missing.

Glasses?

What do you mean by that?

-Ah, I'm so dead. -Where are you right now?

I'm heading to the school now. Let's talk later.

School? Why are you going to school at this hour...

Hey...

Hey!

I haven't been on the rooftop in a while.

How did you know it was me?

Ah, so Kim Hye-yeong told you.

No one saw you when you came, right?

Why are you asking that?

Where's the money?

You can't live like this.

Why are you saying this all of a sudden?

Would it be better to live like you?

You were an outcast anyway, weren't you?

Not anymore.

Please, Seon-ah.

I have a child.

My wife is about to have our second.

If I get fired...

...what will happen to my family?

And with my small teacher's salary...

...how am I supposed to come up with 20 million won all at once?

You knew perfectly well that Kim Hye-yeong and Choi I-seul were bullying me.

And yet you all pretended not to see anything.

Just because of Choi I-seul's parents.

Seon-ah.

For that, on behalf of everyone, I apologize.

I'm truly sorry, okay?

Don't make me laugh.

Seon-ah, let's do this for now.

First, delete those photos from your phone.

Then tomorrow, I...

I'll do as you wish.

Somehow, I'll get the money...

(Wife)

(Explain this. Are you even human?)

Did you send this?

You already sent it?

What are you talking about?

Why? Why!

Seon-ah.

(Lee Soo-hyuk)

(Arin)

(and Lee Da-hee)

You're looking for evidence, aren't you?

Who are you?

I'm Lee Gyeong-jin from Class 5.

You think it was a suicide, right?

Excuse me, do you know whose glasses these are?

Try them on.

I think they'll suit you.

I heard you were about to get married.

Why did you suddenly break up?

Before the wedding, I saw...

...her in bed with my friend.

If you can find out something like that before getting married, that's what people call...

...a blessing from your ancestors, right?

Teacher.

If... you found out someone close to you was cheating...

...what would you do?

If it were me...

...I'd want to expose everything...

...and watch it all get destroyed with my own eyes.

"S LINE"

"S LINE" (A red line connecting people who have had a sexual relationship)

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