None

The whole show doesn't contain any sexual content. The only thing that is mentioned is when a few boys talk about hot girls in one scene, not detailed or long.

A couple very mild references to a student that slept with a girl. Not graphic.

A boy is taking a shower.

A boy is standing, wearing boxer shorts.

No Nudity In Whole Series But Profanity Is Moderate Many Cursed Words Used.

Non graphic male on male sexual assault scene. Short but distressing.

At first episode minute 13 -14 approximately some boys are talking abt their private parts. Nothing "too" disturbing.

In the second season, a guy asked his friend if he would come with him to go and pick on girls, matter of seconds, ignorable.

There's a short sexual assault scene: a bully gropes another boy, the boy was clearly telling the bully to stop but he doesn't listen. No nudity is shown and he is stopped.

There is a lot of bullying and fight scene during the show.

A character stabs another character's hand with a pencil. He also wraps another character's head in a white curtain and repeatedly hits him with a book, as the blood soaks the curtain. When he lets go, the bloody face is shown of the guy who was hit.

Multiple fight scenes. Characters fight using fists, bats, flower pots, chairs, pencils, poles, and other surrounding objects.

A fight scene between two characters takes place in a workout room in a school. A character hits the other character's leg with a weight, and smashes his face into a nearby piece of equipment.

Characters threaten to kill each other, and get involved in gangs.

A character is stabbed in the foot with a pair of broken eyeglasses. Not detailed (season 2)

Lots of fight scenes.

People get stabbed with pens, glasses, etc.

The series has many fighting sence with pens.

The Korean words for "f*ck" and "son of a b*tch" are used a few times throughout the series.

Season 2 has numerous uses of "f*ck" and other strong language.

Quite strong language.

High profanity and abusive language.

Season 1: 251 uses of fuck, 8 uses of motherfucker.

Season 2: 219 uses of fuck, 13 uses of motherfucker.

470 uses of fuck, 21 uses of motherfucker.

We can see person buying drugs and smoking.

A student is drugged without his knowledge.

Many high school students are seen smoking, drinking, partying, and buying drugs.

Characters smoke, people go to clubs and party, people drink, and some buy drugs.

Most of the fight scenes are frightening and intense.

LOTS of bullying and fighting. Sometimes attackers use knives.