Who is Agent Adamina? Top secret agent worked under Head Officer Im Changkyun at Gangnam Police Department. She is mysterious, sly and intelligent agent. She knows everything to discover secrets behind different cases. She is going to tie the knot with her sub-unit team leader, Agent Lee Hwitaek. Sergeant Coups, team leader of Seventeen, works under Head Detective Wonho at Seoul Police Department. Agent Adamina and Sergeant Coups are forced to join forces to solve a case. Not just any case. A serial killer case which the suspect, not one. Not two but a number of them. Not only murder. Drugs, well there is a lot more. How to solve this crazy case when it all links to one thing? Adamina's past.