One of the protagonist's father is a player, he is seen with other woman.

Some scenes contain fighting with martial arts and some blood is shown

Shoot-outs and hand-to-hand combats are seen

A man commits suicide by shooting himself in the head (fake-looking blood spurts). His dead body is shown with a puddle of blood over his head, he is dragged away.

There are some scenes of talking about violent ways of killing

The main protagonist suffers from PTSD

The main protagonist is seen in frequent peril

The main protagonist fights a lot in this show, although some blood is seen, the violence is pretty average for a normal action thriller show

There are some infrequent uses of "shit" and "son of a bitch"

Normal PG-13 level language

Mostly mild profanity including uses of "damn" and "hell.

The protagonist smokes regularly

Some people drink

The fight scenes could be a little more intense than an average k drama fight

Mostly 13-14+ can handle it

Anna(another main protagonist) is also in constant peril but it mostly saved by Je-ha