BaekXX Park Taejun Manhwa Company, Sergeant / Punchkick(HID) Federal Informant Baek Yisu' and a criminal gang's boss, Baek Dogyeong' are twin brothers.With the same faces the two twin brothers have lived different lives until now. Yisu, who's been betrayed by the gang, throws away his identity to become his brother. This federal agent is soon to become the gang's boss!

Sejong's secret weapon, Shadow Unit informer.'Gwiyoung, called the Ghost's Shadow, has been wandering around the battlefield since childhood.Vowing to get revenge, he decided to become a member of the nation's first special forces as an informer.