It is implied that two characters in the movie are gay lovers, although it could also be implied that they are just really really close friends.

A man gets shot in the back of an alley. Not graphic.

A man stabs another man during a struggle in a car. You see them fighting, then the man realizes that he has stabbed and killed the other man.

Two men gets into a fist fight in a tunnel. It ends when one of the man overpowers the other and shoots him.

A man enters his car and his car blows up.

A man commits suicide by gun.

A group of men drink shots of alcohol, only to be poisoned. They all start vomiting blood.

A dead corpse is hanged hundreds of feet in the air.

It is in Korean but they use words like "fuck, Bitch, Shit."

People drink and smoke in the movie. A character is shown drunk.

A character injects some drugs (myth) and get high.