Synopsis：While working on a new drama with her lover and star writer Geunyoung, assistant writer Dal-ah discovers he is having an affair with the lead actress Hyojung. Heartbroken, she drinks herself into a stupor and falls asleep beside her beloved dog Mungmung. The next morning, she wakes up to find a man claiming to be “Mungmung” lying next to her—and inexplicably believes him. As Geunyoung’s drama falls into crisis and new actress Isu joins the cast, a chain of unexpected events begins to unfold.