Three unrelated men and women, Kang Hae-joon (played by Hwang In-yeop), Yoon Joo-won (played by Bae Hyun-sung) and Kim Sun-ha (played by Jung Chae-yeon), each carrying the hurt they received from their parents, relied on each other and spent more than 10 years like a family.Youth time.Ten years later, they met again, facing the entanglement and choice between family, friendship and love.