Soo: Revenge for a Twisted Fate (2007)

A legendary assassin and a renowned problem solver, Soo has been searching for the twin brother he has not seen since their days in an orphanage. But his brother is murdered when he turns against a vicious gang to become a police officer. In order to get revenge, Soo has no choice but to take on his brother's identity and use it to lure the gang into a trap.