The film tells the story of an 11-year-old girl, Dada, who suffers from psychological distress and troubles due to a sudden change in her family situation, leading to emotional depression and withdrawal, ultimately forcing her to drop out of school. Her mother has no choice but to send her to live temporarily at a horse ranch run by her cousin.

18岁少年程非自幼无母，由父亲和奶奶抚养成人。他叛逆不羁，酷爱滑板，立志成为专业滑手，却不被父亲程建国接受。程非在父亲房间发现一张寻人启事，失踪者竟是自己失联两年的网友“燕尾蝶”— 何生。程非他假扮租客住进何生母亲何秀晴家中，却意外揭开了这对母女和自己千丝万缕的关系。 神秘消失的何生，深埋谎言的程建国，古怪孤僻的何秀晴。两个家庭的往事迷雾里，程非逐渐靠近尘封多年的真相……