Rent Fist 2 Fist (2011)

As a young man hanging with a bad crowd, Ken Min failed to stop his friend from killing a young couple, leaving their infant son orphaned. After his friend goes to jail for the crime, Ken spends his life running away from his shame. Seeking redemption, he teaches mixed martial arts out of a youth club. But Ken is ultimately forced to face his past when the orphaned boy finds his way into Ken's life, and Ken's vengeful friend is released from prison. When he discovers that these two events are not a coincidence, Ken must choose between a heroic act of self-sacrifice or the self-preservation of running away.