The whole of Korea can't find another master of emotional games, Seok-ho (Choi Won-young), and the innocent female college student Chae-young (Kim Fu-lun). The normal story seems to be rewritten the moment they meet. Seok-ho, who has always been easy to get, seems to have become the passive party. His image of a perfect lover who has always been invincible has been ignored for the first time. Even with his affectionate tears, he can't move the woman in front of him, because the other party is determined to keep pure. Everything makes Seok-ho feel incredible. Then is the truth only on the surface? The innocent Chae-young and her boyfriend Sun-soo (Lee Jung-woo) have a strong and inseparable relationship, but they are still just nominal boyfriends and classmates. The hot-blooded Sun-soo has to go out to cheat. He meets Ji-yeon (Go Da-mi), an older woman with a perfect S curve, in a nightclub. The two gradually develop from a one-night stand to a couple in bed, but Sun-soo is just one of the countless men around Ji-yeon. Who will be the final winner among these protagonists with complicated relationships that make people headache? One-night stands, romantic relationships, cheating, and the temptation of desire are going on between several people.