Lin Yuyuan is a very good man, and Qiao Xiyu has always known this. Although he is very kind to her, very considerate, and very warm, he can only be regarded as childhood sweethearts. When she leaves Lin Yuyuan to go to another university, she meets not only Ji Dongyang, but also the love that will be remembered for a lifetime. Ji Dongyang's departure, Qiao Xiyu's waiting, and Lin Yuyuan's waiting. This is only unforgettable but not unforgettable.