Rising to despair

This the story of (Wang, a 16 year old high schooler comes home to see his family was murdered. The killers left a messenger saying it was because a debt to the leader of the underworld . He vowed revenge against the scum who killed his family. He decided that he needed money and power to get revenge. So he went overseas to be a paid mercenary. 2 years later he comes back to Korea. Will he get defeated on his quest for vengeance.