His name is Zhou Kai and her name is Zhu Mo. In the reading room on the third floor of the matchbox-like boring library of University A, she, a junior, met him, a senior, holding a World Heritage book in her hand. They bonded here. As the final exam was approaching, they agreed to come here every day to read and review. Two months later, he blushed and said to her: "Let's date!" She said: "I don't want it!". In order to avoid him, she stopped going to the third floor of the library. Half a year later, when he was about to graduate, she said: "Can I be your girlfriend?" He said: "I already have someone I like." Then, he went to graduate school and she graduated, and she could no longer contact him...