Fang Lijuan (played by Miriam Yeung) lives a flirting life with Ou Haiwen (played by Daniel Wu) every day. When Lijuan tried hard to train herself to be a good daughter-in-law to please her future father-in-law, she accepted another new task - to protect the princess of a certain country who was about to arrive in Hong Kong, but encountered funding problems. Lijuan asked Haiwen for help, which aroused Haiwen's dissatisfaction, and the two had a cold war. Lijuan even thought that the princess seduced Haiwen, and fought with the princess, and was ordered to suspend her. It turned out that the police wanted Lijuan to accept another undercover mission, to go to the country as a socialite to approach Han Yang, the head of the theft group, and obtain evidence of his crimes. Haiwen followed him to Shanghai, but he and Lijuan both fell into Han Yang's hands. Han Yang threatened Lijuan that he needed to exchange Haiwen with a priceless red wine, and Lijuan, as a police officer, was in a dilemma...