Friend 2 (2013)

Synopsis: Childhood friends Jun-seok and Dong-su are members of two different gangs. The two gangs are involved in a power struggle, and Dong-su is murdered by a member in Jun-seok's gang. Although Jun-seok has nothing to do with Dong-su's death, he claims responsibility for his friend's death and serves an 18-year-sentence. Meanwhile, Dong-su's son Seong-hun grows up and also joins a gang. He spends time in prison where he meets Jun-seok. Unaware of the fact that Jun-seok is connected to his father's death, he starts to feel both admiration and jealousy towards charismatic Jun-seok. Upon his release from prison, Jun-seok takes in Seong-hun as his right hand in order to reclaim his power. However, the table is turned when Seong-hun finds out that Jun-seok has something to do with his father's death.