Childhood sweethearts, they thought they would stay with each other until their mother kicked her out of the house and he made a vow to see her again in thirteen years. She had been waiting for him silently for thirteen years. She thought she could no longer wait for him. Until I met another sunny, enthusiastic and boyish person on the university campus. The bamboo horse finally appeared, and she chose to let nature take its course. There is another her beside Zhuma, who is her best friend. Why did Zhuma forget his vow? How will he face her when she meets her first love on campus again? How would she choose?