Ling Ziming and Cheng Yi are childhood friends. They come from two incomplete families. Ling Ziming has been living together with the second eldest aunt of the maternal side since his childhood, while Cheng Yi has been brought up by his grandma. Because of the similar family background, the two boys supported each other emotionally. But as they entered the puberty, their psychology underwent dramatic changes. Still being young, the boys have no ideas what love is. Though attempting to get close to each other one after another time, they unexpectedly get increasingly estranged from each other.