Resurrection(2005)

Resurrection is a South Korean drama about identity, revenge, and psychological warfare. At age seven, Yu Gang Hyuk witnesses his father's murder and is separated from his identical twin brother. Raised as Suh Ha Eun by an adoptive father, he becomes a cop driven by his father's unsolved death. When Ha Eun investigates a suspicious suicide case, he discovers his twin's existence and learns the truth behind the original crime. Before the brothers can reunite, assassins mistakenly kill Shin Hyuk, believing him to be Ha Eun. Devastated and determined, Ha Eun assumes his dead brother's identity and infiltrates the criminal underworld as an undercover operative. What follows is a tense cat-and-mouse game as Ha Eun methodically pursues psychological revenge against those responsible, blurring the lines between justice and vengeance.