In 1995, Korea and Japan team up in a joint investigation to dismantle the illicit drug trade flowing from Korea to Japan. Junmo, a countryside detective, courageously ventures undercover into the rising evil gang, Gangnam Cartel, seeking a special promotion. Little did he know that he was walking into the complex relationship between his wife, Euijeong, and Kicheol, the boss of Gangnam Cartel. Caught in the inescapable web of fate, Junmo’s anxiety increases. He must dig deeper and move faster to unravel the truth. Can they ever return to their normal lives once the mission is complete? Who will have the last laugh in this game and who is the worst of evil?