Xia Ran (played by Yang Zi) and her boyfriend Jiang Jiannan (played by Guo Peng) have been in love for many years and their relationship is very stable. However, one day, Jiang Jiannan disappeared after breaking up with Xia Ran. Xia Ran, who was inexplicably confused, was determined to find Jiang Jiannan to find out the reason for the matter, but she met Jiang Jiannan's roommate Jin Zhihao (played by Qiao Zhenyu) by accident. Xia Ran agreed to pretend to be Jin Zhihao's girlfriend to comfort Jin Zhihao's mother who had always been worried about her son's emotional problems. In exchange, Jin Zhihao agreed to help Xia Ran find Jiang Jiannan's whereabouts. In the process, Xia Ran and Jiang Jiannan gradually developed a sincere relationship. However, at this juncture, Jin Zhihao's ex-girlfriend suddenly showed up, which put Jin Zhihao in a dilemma. Seeing this, Xia Ran silently chose to withdraw.