Young-joon and So-yeo are a young couple with their marriage relatively stable. On a day their mutual friend opens a wine bar, they come across Min-jae and Yu-na, a couple quite the opposite of themselves.

Officers Cho Kyung-yoon and Park Eun-joo are on the hunt a killer following duo of ghastly murders. The victims carry a common military past, and the secret of their past must be unraveled to find the killer.