High school sweethearts QiaoQiao and Li Xing are about to graduate from university and Li Xing surprises QiaoQiao with a marriage proposal. QiaoQiao, however, declines the proposal, offering rash arguments as to why he's not ready. Little does he know, QiaoQiao has a devastating secret. Nonetheless, they write a break-up contract; if they're both single in five years, they'll get married. The two part ways and five years pass. Believing Li Xing is still waiting for her, QiaoQiao waits patiently ...