S LINE RED LINES THAT CONNECT SEXUAL PARTNERS
Why are you so slow?
- You can do it. - Hurry, Teach. We're going to be late.
Let's go!
Teach, we're going on ahead!
See you later!
Kids, be careful. Don't get hurt.
I'm late.
Miss.
Here.
I'm a mess, how could I forget?
Thanks, Joon-seon.
Wait.
Hey, Class President.
What's for lunch today?
How would I know?
And also,
we're not even in the same class, why do you keep calling me "Class President"?
What does it matter? You've been class president every year.
What's for lunch today?
Ugh, so annoying.
What? Tell me.
I don't know.
Tell me.
This guy's seriously messed up in the head.
Get lost, you idiot.
You get lost, you moron.
Why are you starting this crap again? Dude, what's your problem?
So pretty.
Hey.
Where should we go this weekend?
Wherever you want to go.
Okay.
Last year, 5.9% of teenagers had
sexual intercourse.
According to Statistics Korea, 3,096,947 people fall
into the teenage demographic.
That would mean at least 170,000 of them have had sex.
Only 170,000?
THE ANIMAL KINGDOM
I CAN SEE THE SAME WORLD AS YOU. COME TO BANGJU HIGH SCHOOL.
GET LOST, YOU STUPID BITCH
KANG SEON-AH ONE DAY, I'LL TELL YOU HOW I FEEL
Hey, you drew her too pretty.
Make her look more like a loser.
THE CRAZIEST BITCH OF THE CENTURY
Seon-ah's pissed. Oh, no.
"Dear Ji-won."
"Hi..."
"I'm sure you don't know who I am,"
"but I've liked you for a long time"
Hey, kids.
Kids.
Seon-ah.
Even so, violence is not the answer.
When you start the attack,
it makes it hard for me to take your side.
I'm going to kill her.
What?
Miss.
I'd like to go home now.
BANGJU POLICE STATION
PERSONAL DETAILS
Ji-wook, that was really screwed up.
What do you mean? What now?
You sent me into that bastard's den and took forever to come back.
I nearly died in there.
I swear it was an emergency. I'm sorry.
I have to write an official apology for firing my weapon.
If you shoot to save someone, you have to write an apology.
If you don't and protect the criminal's rights,
the press eats you alive.
Either way, it's crap.
Why are you still looking at that?
We already caught the culprit.
Something's off.
What?
I just don't get why he killed them.
He had relationships with all those women.
It was probably another crazy bastard suffering from an inferiority complex.
He has a history of domestic violence on his record.
That's why he was working privately after high school.
That happened last year.
Why did he have to do it now?
Because it's hot?
That punk kept talking about salvation or whatnot.
Are you sure he's not religious?
Yeah, according to people who knew him,
he actually kept his distance from religion.
A religious math teacher.
That just doesn't sound right.
ASSAILANT'S RESIDENCE (HOME, LIVING ROOM)
Lines?
What the...
What the hell is this?
Seon-ah, did you eat?
Hey, where are you going so late?
What the...
What is all this?
Seon-ah.
Hurry and get in. I'll give you a ride.
Unbelievable.
Hurry up.
I'm so sick of having kimchi stew all the time.
It's kimchi stew every day.
Hurry up.
What? Is she a virgin?
The one who finishes their lunch last...
That bitch.
TEACHERS' OFFICE
No way.
Quiet.
We have a new transfer student joining our class today.
Her name is Shin Hyeon-heup.
Hyeon-heup, would you like to introduce yourself?
Well, I hope you get along well with your classmates.
If you have any questions, you can ask Joon-seon, the class president.
You can take that empty desk over there.
Go ahead.
Everyone should get ready for the fifth period.
Yes, Miss.
Damn,
Why can't she talk?
Is she a mute?
THE BEST EDUCATION FOR ENTRANCE EXAMS LED BY THE BEST TEACHERS
OH JEONG-MIN, MATHEMATICS
Glasses...
Sorry.
Why are you in such a rush?
It's nothing.
Want to meet up after work?
Sure, text me.
TEACHERS' OFFICE 1, EDUCATIONAL PLANNING
Can I help you with something?
I'm Detective Han Ji-wook from the Bangju Police Station.
I just have a few questions.
You're Seon-ah's father, right?
No. I'm her uncle.
No wonder. You look young.
Seon-ah is going through a hard time.
I'm sure you're aware of that?
I've been busy lately, so...
I'm sorry, I haven't been looking after her well.
It's okay.
But I'm not here because of Seon-ah.
I'm here to investigate a murder case.
A murder?
Yes. I'm sure you're aware that a serial killer was recently arrested
at Wanseong Apartments.
Unfortunately, I don't live in this city.
Then, do you know the name Mr. Oh Jeong-min?
He was a math teacher here until last year.
Yes, I know Mr. Oh.
No way.
Are you saying Mr. Oh is dead?
Yes. Not as a victim, as the assailant.
My gosh.
Are you saying Mr. Oh killed people?
So, the thing is... this might sound a bit strange,
but did Mr. Oh always wear glasses?
Glasses?
Yes.
I'm not sure.
I've never seen him wear them.
Have you lost your mind?
I don't have any money to give you.
Stop bothering me.
What's this?
Are you getting reckless now?
Damn. Have you run out of things to be ashamed of?
It's time you were ashamed now.
What?
Why should I be ashamed?
Tell me.
Why should I be ashamed?
Stop it.
What's this now?
Are you two in a set?
What the hell? Are you trying to jump or something?
No. We should jump together.
Let me go!
Somebody, help me. Damn it!
Promise me.
That you won't bother either of us again.
Okay.
Let me go!
You're crazy.
Hye-yeong, are you okay?
Why are you butting in?
Did I ask you for help?
Are you still mad at me?
Why would I be mad at you?
Just mind your own business.
Come on. Let's go.
Do you want to see Seon-ah before you go?
She should be out of school soon.
No. She'd freak out if she knew I was here.
Then, I guess I'll contact you if I remember anything.
Okay.
But...
- Your... - Yes?
Oh.
Why is it...
What? Why was he here?
Excuse me.
I heard this man was a regular. Do you remember seeing him?
Yes. What about it?
I'm Detective Han Ji-wook from the Bangju Police Station.
I'm in the middle of an investigation.
He used to be a regular here.
Though he hasn't been coming recently.
Was there anything strange about him?
I'm not sure. He always came alone and drank quietly by himself.
But I noticed he started talking to himself a lot at one point.
I thought he was just drunk,
but he was perfectly fine when he left.
He talked to himself?
He was just saying numbers.
I mean... he
was just counting numbers like, "One, two, three."
Then, eventually he got into a fight with another customer...
Twenty-five. Twenty-six. Twenty-seven. Damn it. Again.
One, two...
This guy seems a little strange.
Excuse me.
Do you have something to say to me?
Wow. Fucking a lot of them.
What are you saying?
Have you lost your fucking mind?
Oh, and I think he was wearing glasses.
Thank you.
I can't believe there are still people walking around with notebooks.
It's cute.
Hold on.
What's so cute about notebooks?
But why did you pretend not to know me at school?
How could I with all those kids around?
MISEONG MOTEL
KANG SEON-AH: 1 IMAGE ATTACHED
Bitch.
What's wrong?
It's nothing.
I've been so tired lately,
my skin is a mess, isn't it?
Is it? No, it's not.
Teacher.
What would you do if someone found out about us?
I'm not sure. What do you think?
Maybe, I'd run away with you!
What should I do?
MISEONG MOTEL
It seems you've forgotten that we're minors.
He'll be punished but not me, you idiot.
Did you see the news yesterday?
A teacher at Jeongil High School was caught sleeping with a student.
The world's gone mad. The teacher is definitely responsible,
but honestly I don't know what students are thinking these days.
You're pretty, aren't there students hitting on you, teacher?
Don't say that. That's inappropriate.
Sir, that's sexual harassment.
Oh, really?
My apologies.
It's okay.
It's fine if it's about a man, right?
Our language teacher is quite a looker too.
Be careful. Lest you be found out with a somewhat strange female student.
As if they'd be interested in an old man like me.
Let's go.
UNKNOWN SENDER
Aren't you going to class, teacher?
Yes, I should go.
GET 20 MILLION WON READY
Will 20 million won be enough for a down payment?
I'm not sure.
I just want to escape from this cursed place.
Are you trying to move out? Why?
I don't know. I'm just sick of it all.
This apartment, this city, the people living in it...
It's not like I have a family. I'll have to live alone anyway.
Isn't that detective your family?
How can an uncle be family?
He doesn't care about me anyway.
But at least, you have someone.
What about you? Do you think your mom is still alive?
I don't know.
Then again, she would have reached out if she were still alive.
Mom, Dad called me a pig again.
Gosh, why do you guys fight at every meal?
Hey, Hye-yeong.
Are you going to keep sleeping in class
and going to the bathroom? So?
Your behavior is not acceptable.
What are you trying to pull here?
What was that about earlier?
Were you out just to get me?
Do you know something? Is someone threatening you?
Oh, so you got the photo. It was from Kang Seon-ah.
Kang Seon-ah?
The 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. Don't take it out on me. This is bullshit.
Kim Hye-yeong!
Your way of speaking to the teacher, what's that?
Teacher. I sincerely apologize.
I should get to class now.
You bastard.
How did Kang Seon-ah...
But seriously, how did she find out?
What picture? Where was it taken?
I told you to be careful!
What do you think you're doing?
- What? - What? How can you say that now?
Are you going to break up with me to hang out with that bitch?
Oh, were we dating?
Hey!
Did I talk?
- You did. I got photos. - Why would I? It was you.
You must have been thinking about it or mentioned it.
Are you sure you didn't say anything?
Keep it down, we're at school.
Did you get drunk and go telling everyone?
Are you out of your mind?
Those glasses...
What?
Have you always worn them?
My eyes got bad.
What are you doing? Give them back.
You can see something with these, can't you?
What are you talking about?
The red lines.
You can see them too?
Then, how many lines do I have on my head?
One.
Choi Da-hye has five.
Kim Hye-yeong has two, one with the Korean teacher.
Choi I-seul has more than ten.
The gym teacher is having an affair. Should I go on?
How?
Where did you get those glasses?
I just found them.
It's the truth. They were in my locker.
Give them back to me.
They're dangerous.
How can a pair of glasses be dangerous?
You know what happened to your neighbor recently, right?
That man was wearing these glasses.
He was seeing the S Lines.
S lines? Oh, so that's what they're called.
So what?
I don't care who made them
or who they originally belonged to.
They're mine.
Hey, Teacher.
Yes?
You have a Seon-ah in your class, right? A Kang Seon-ah?
Yes, I do. Why do you ask?
What is she like?
She hasn't been behaving well in my class recently...
Oh, really?
She hasn't had any problems recently.
Do you want me to talk to her?
Oh, really?
No, it's okay. I'll try to talk to her.
Okay.
You're looking at my S line, right?
No, I'm not.
But do you know how to get rid of it?
Not sure.
Maybe the partner just has to die?
Are you going to keep those glasses?
Of course.
I'm going to show them how pathetic they really are.
GET 20 MILLION WON READY
Is this your first time?
No.
Are you okay?
I HAVE THE 20 MILLION WON. MEET ME ON THE SCHOOL ROOFTOP AT MIDNIGHT.
Who is it?
My investor.
Where do you want to go?
What?
How about karaoke?
PHOTO BOOTH
What are you doing?
This won't do.
Let's look this way.
What's this?
They're mine.
Then you should just shut your mouth too.
What's with that face?
The top ones came out really well.
Damn it!
What's wrong?
What?
Excuse me, did you find a pair of glasses in there, by any chance?
Hello?
It was you, wasn't it? You took them!
What are you talking about?
My glasses! They're gone!
Glasses? What are you talking about?
Damn it. I'm late.
Where are you now?
I have to go to school now. I'll talk to you later.
School? Why are you going to school at this hour?
Hello? Hey!
BANGJU HIGH SCHOOL
It's been a while since I've been up on the rooftop.
But how did you know it was me?
Oh. Hye-yeong must have told you.
No one saw you coming up here, right?
What's the point of asking that?
Where's the money?
You shouldn't live your life like this.
All of a sudden?
Then, should I be more like you?
You were an outcast anyway.
Not anymore.
Please, Seon-ah. I have a child. My second one is due soon.
What's my family going to do if I get fired from here?
And where would I suddenly get 20 million on a teacher's salary?
All of you knew that I was being bullied,
by Kim Hye-yeong and Choi I-seul.
But, you guys just ignored it.
All because of Choi I-seul's parents.
Seon-ah, let me apologize to you on behalf of everyone. I really mean it.
Whatever.
Seon-ah, then how about this?
Let's first delete that photo on your phone.
Then, I'll get you that money somehow by tomorrow.
WIFE
EXPLAIN THIS.
HOW COULD YOU DO THIS TO ME?
Did you send it?
You already sent it?
What are you talking about?
Why?
Seon-ah.
You have to look for evidence.
Who are you?
I'm Lee Gyeong-jin from Class 5.
So you think it was a suicide attempt?
Do you happen to know whose these are?
Try them on. I bet they fit.
I heard you almost got married. What happened?
Right before the wedding,
I saw her in bed with my friend.
For that to happen before the wedding
is the best luck you could ask for.
If you found out
that someone you know is having an affair,
what would you do?
I would let everyone know
and let all hell break loose.
RED LINES THAT CONNECT SEXUAL PARTNERS