After Lin Chuan is dumped by Xu Xiaowan, he runs into his ex-girlfriend entering a hotel with an upperclassman. Heartbroken, he goes drinking with his best friend and unexpectedly encounters Jiang Wei, the campus belle. The two bet over whether a household registration booklet is required to obtain a marriage certificate, but through a series of unexpected twists, they actually end up registering their marriage. They agree to divorce one month later. To keep the marriage a secret from Jiang Wei's grandmother and relatives, the two are forced to live together. Meanwhile, Lin Chuan takes devoted care of Jiang Wei's father and gradually earns his approval. What began as a joke turns into a secret married life on campus, ultimately culminating in a heartfelt proposal and a happily-ever-after ending.