Xia Qing was sent to university by her brother Xia Jin, and was given a single dormitory specially requested by Xia Qing to take care of her. Before the start of school, Xia Qing inexplicably lost her spare toiletries, and a new roommate came to the single dormitory that she had agreed upon: Shen Yan, Xia Qing's high school classmate and crush. Xia Qing liked Shen Yan but did not dare to talk to him because of his cowardice, until the weak-looking Xia Qing was robbed by Huang Mao who was wandering at the school gate during evening self-study. Shen Yan appeared to help Xia Qing, which was also the first fight in Xia Qing's life. Xia Qing and Shen Yan were in different majors. Xia Qing fainted during military training and was sent to the infirmary where she met Lin Cheng, who was transfusing glucose in the infirmary because he was avoiding military training. Lin Cheng was sunny and cheerful, and took the initiative to talk to Xia Qing. Because she was in the same class as Shen Yan, Xia Qing took the initiative to ask Shen Yan, but Lin Cheng didn't know. After returning to the dormitory, he told Ana Shen that Lin Cheng was ridiculed by Ana Shen. Xia Qing wanted to take classes with Shen Yan, so she chose the same elective course. However, she met Lin Cheng again during class. Lin Cheng enthusiastically wanted to invite Xia Qing to lunch. Shen Yan, who had skipped class, saw this and made another sarcastic comment. I went to watch the basketball game of Shen Yan's club to cheer for Shen Yan, and was talked to by Lin Cheng inexplicably. The perverted and sadistic mother, the strange words of the neighbor and roommate, the memories of high school classmates, Huang Mao who reappeared but was accidentally killed... Shen Yan, does it really exist?