Although they are not biologically related, Kim San-ha, Yoon Joo-won, and Kang Hye-joon share a close relationship with each other. The trio spent their teenage years being raised by Joo-won’s father, Jeong-jae, and San-ha’s father, Dae-ok, who did their best to provide them with a happy childhood while they recovered from past traumas. However, upon reaching adulthood, San-ha and Hye-joon searched for their biological families, leaving Joo-won behind. Ten years later, their five family members are reunited, but things are not the same as before. Joo-won feels a bit resentful after feeling abandoned by San-ha and Hye-joon, while the boys struggle with new romantic feelings for Joo-won and their own family issues.