Chu Zhiyi is the fake daughter wrongly taken in by the Chu family, treated since childhood as a tool to cozy up to the powerful, and is betrothed to the playboy Zhou Hen. Spotting her fiancé cheating at a masquerade ball, she impulsively kisses a mysterious man—CEO Yan Jingting, rumored to be tyrannical, but who has actually been falling for her long ago. At the real daughter Chu Hui's birthday banquet, she is exposed publicly, the DNA test confirms it, and the Chu family turns hostile, actually intending to marry her off to the Liu family in exchange for fifty million. In desperation, she escapes the Chu family, intercepts Yan Jingting in the heavy rain, and buys a one-year contract marriage for one hundred million. After marriage, he protects her everywhere and introduces her to elders; while interning and preparing for exams, she fights Chu Hui and Zhou Hen, teams up to overthrow Chu Heng, and is officially proclaimed as his wife at a birthday banquet. In the end, she breaks free from her shackles, and the contract couple gradually develops genuine feelings.