The drug "Pink out" circulated in Korea not long ago. Seol Chung-won encounters Baek-young, who was with the drug gang at the scene. Where he was deployed to corporate in the investigation. Baek-young who didn't give the drug to Seol Chung-won asked for, rather swallowed it and two suddenly spent a one night stand. But Baek-young's drug reaction test didn't show anything on the next day... "What the hell is this guy doing?" The story of Chung-won, The Ace of Drug Investigation Department, who struggles as he picks up Baek-young's secret.