재혼을 생각하는 동국은 아들 진영에게 새엄마 경숙을 소개시켜준다. 가족모임에서 진영은 새엄마의 동생 현숙을 보고 놀라는데 바로 며칠 전 자기의 원나잇 상대! 술자리는 무르익고 취한 채 한방에 누운 진영과 새엄마. 한편 단 둘이 술을 마시던 동국과 예비 처제 현숙 사이에도 묘한 기류가 흐르고 그 순간 진영의 여친 주연이 술에 취한채로 나타난다.Dong-gook, who is thinking of remarrying, introduces his stepmother Kyeong-sook to his son Jin-yeong. At the family gathering, Jin-yeong is surprised to see his stepmother's younger brother Hyeon-sook who was his one-night stand just a few days ago! Jin-yeong and his stepmother is lying down, drunk. Meanwhile, there is a strange atmosphere between Dong-gook and Hyeon-sook, who were drinking alone, and at that moment Jin-yeong's girlfriend Joo-yeon appears drunk.