The Summer of Our Graduation.

Talented performer Zhang Chong has been secretly in love with the school beauty Xiaoxia for more than ten years, but because she is the girlfriend of his younger brother Lan Kai, he can only keep his true love deep in his heart. The day before graduation, Lan Kai finds Zhang Chong and mysteriously asks him to help him come up with an excuse: tell Xiaoxia that he wants to break up!