Managers Im Yoo-na and Kang Ji-won looked like an in-house couple. However, Yoo-na will actually marry team leader Byeong-seok who has a heart for her. Even after marriage, Yoo-na can't seem to forget Ji-won. Byeong-seok thinks that he's having a stable marital relationship with Yoo-na, but he can't relate to her feelings. He deliberately invites Ji-won to his home. Byeong-seok's obsession gets worse, and the three hide their true feelings for each other, and the relationship becomes strange.