Good Person (2003)

Original title: 좋은 사람

20 years ago, Park Joon-pil is the son of a mafia boss and Kang Tae-pyung is the son of a police officer. At the department store, while Kang Tae-pyung's dad attempts to arrest Joon-pil's dad, both the small boys become orphans. A fellow police officer takes in Joon-pil as his own son, thinking that the little boy is Tae-Pyung. Tae-pyung, however, is taken into an orphan home. Joon-pil knows he is a criminal's son. 20 years later, Joon-pil is an aspiring young police officer and Tae-pyung is a boxing bum. When Tae-pyung's best friend becomes unfairly murdered, he vows to become a police officer. Two years later, Joon-pil and Tae-pyung finally meet again. Rivals but friends at heart, these two guys learn to forgive the past and embrace the future