A man's peaceful life with his wife and children is turned upside down when an actor, who claims to be his son, turns up at their house.

Ahn Joong-Hee (Lee Joon) is an actor who used to be a member of an idol group. One day, he appears in front of a family who consists Byun Han-Soo and Na Young-Sil and their 4 children including Hye-Young and Mi-Young (Jung So-Min). Joong-Hee begins to live wth them

A family lives on the outskirts of Seoul. Byun Han Soo is the father and His wife, Na Yeong Shil is a dedicated, responsible mother to his three daughters and one son including Hye Yeong, Mi Yeong, Ra Yeong, and Joon Young. Suddenly one day, Ahn Joong Hee shows up at the household and declares that he is the son of the family. Joong Hee is an actor who used to be a member of an idol group. He begins to live with them.