Key's parents died when he was 16 years old, leaving him to raise his baby brother, Taemin on his own. Raising him to be the smartest yet innocent Taemin is now. Now fifteens years later, Taemin is a smart straight-A student and is just starting high school.  But what happens when he meets Minho, the most popular and handsome guy in school? Minho leads Taemin down a path of , drugs and petty crime (like stealing money and selling drugs). As Taemin transforms himself and his identity, his world becomes a boiling, emotional cauldron fueled by new tensions between him and Key as well as his best friend, Onew and Minho's older brother, Jonghyun. Starting a bad habit, Taemin starts to cut in order to release the emotional pain he suffers from his broken home.