Leeteuk and Kangin are a couple who want to start a family. They adopt four teenage boys with troubled pasts; Donghae, Yesung, Heechul, and Sungmin. As the new brothers start their new life and a new high school, they each fall in love with four classmates who serve as the safety net they’ve been looking for, while at the same time helping one another fight personal demons that plague them. Kangteuk, Eunhae, Hanchul, Yewook, and Kyumin.