Baek XX백XX; Mr. Baek; Baek XX; Dupla Baek

Federal Informant Baek Yisu and a criminal gangs boss, Baek Dogyeong are twin brothers. With the same faces the two twin brothers have lived different lives until now. Yisu, whos been betrayed by the gang, throws away his identity to become his brother. This federal agent is soon to become the gangs boss!