Seungwon, the father of 15 years, comes to Doyun, who is now an adult and is about to leave the orphanage. Do-yoon, who accidentally enters his father's house, meets his younger brother, and becomes a family. Everything is awkward, but he gradually gets used to it.However, when his father Seung-won suddenly dies, he postpones his plans to leave for Australia and decides to become the guardian of his younger brother, Jae-min. And in the process of finding his death insurance money, he discovers the truth hidden by his father Seung-won and becomes confused about his identity.