At the beginning in a hotel a man's bare butt is briefly shown then he covers himself with a sheet.

The main character has a brothel and sends prostitutes to his clients.

A man walks around in only his brief underwear for a few minutes.

A prostitute undresses down to lingerie for a customer in a hotel room.

Although this movie deals with a serial killer targeting prostitutes, there is not any graphic sex in this movie.

We briefly see advertisement cards in car windows that features topless women.

At the address Young-min gives to the police, a calender briefly shows a nude woman.

Some discussion of a person being impotent (not in a crude context).

Although there are not a ton of violent scene, the violence that is there is pretty graphic. Overall this is an extremely bleak film.

Someone is brutally killed by 4-5 head blows. The attacker is mainly shown, blood sprays everywhere and on his face and clothes. The victim is partly unconscious and half of his/her blood-covered face is seen for about 6 seconds.

A metal spike is attempted three times to be driven into someone else's head (minimal blood seen). After the attacker injures his own hand, the victim is hit on the head with a hammer offscreen. They lie with a bloodied head in a small pool of blood.

Several bloodless fights/beatings, mostly dealt by hero to villain and others (for angry interrogations or escaping). But a couple of them can be violent. There is also an extended fight with some facial blood, and a small pool of blood is briefly seen at the end of it.

A man walks around a blood-covered room where murder took place, looking unsettled.

A dead woman has a bloody neck and a small pool of blood on her head. Seen for a couple seconds.

A bathroom is shown containing the corpses of two people and an severed injured woman with some blood lying about. No details visible.

A person tries to saw through his/her binds with an edge; some blood on the hand. Several bloody crime photos are on a police desk (brief)

A dead person's head and hands are in a fish tank, the head is seen in a close-up (no blood).

Some slightly bloody hair is shown briefly. A dog is briefly killed offscreen.

Someone is unconscious with some blood on the head/face. He/she is later recovering in a hospital with a couple of minor facial bruises.

A man grabs a prostitute by her hair and is implied to hit her several times. She has a bruise near her mouth and on her cheek. Her pimp arrives later and snacks him several times.

'H*ll' is said at least 10 times.

'D*mn' is said at least 15 times.

'D*ck' is said twice.

'F*ck' is said at least five times.

'Sh*t' is said 11 times.

'B*stard' is said at least 16 times.

'*sshole' is said 13 times.

'B*tch' is said 13 times.

'*ss' is said 4 times.

Reminder that this movie is in Korean.

Some smoking and casual drinking.

A woman smokes a cigarette.

The main character smokes and drinks a beer while sitting with a young child.

Several men smoke together in a hallway.

At least 6 instances of tobacco smoking.

Jung-ho is shown drinking a beer.

Young-min is shown drinking beer from a bottle.

Many scenes with violence and blood-shed are shown and many environment filled with blood.

Violence acts done by the main villain can be interpreted as scary and intense.

Dead corpses are also shown which can be frightening for some viewers.

This is a very dark and bleak film, extremely extremely dreadful film since it is based on a true story about a real killer. The ending will probably shock and depress you. Similar to "I Saw The Devil," there is not a single "lighthearted" scene in this film. It is dark beginning to end.

The film has a pulse-pounding atmosphere and there are a couple of distressing moments.