Hwayi: A Monster Boy (2013)

Hwayi: A Monster Boy 2013 / 화이 : 괴물을 삼킨 아이 2013 / Gwimureul Samkin Ai , Hwayi: Gwimuleul Samkin Ai

A 5-member gang, led by Seok Tae, kidnaps a baby boy named Hwa Yi and raises the baby like their own son. The baby boy is now 17 years old and has turned into a lethal killer. Taking part in his father's gang, Hwa Yi learns about his own past. Hwa Yi pulls out his gun to find out who he really is. (Source: AsianWiki)