Li Huihui (played by Ada Choi) is a senior manager of an insurance company. Huihui, who considers herself a modern woman, strives to achieve the highest performance of insurance policies every day, and always fights openly and secretly with her nemesis Romeo (played by Wei Junjie) in the company. Her boss Liang Zhongwen has helped Huihui a lot in her career. Her colleagues all think that Zhongwen likes Huihui. Although Huihui denies it, she is still happy for no reason. Zhongwen is indeed interested in Huihui, but Zhongwen's behavior of biting birds frightens Huihui and makes Huihui flee. At this time, detective Mok Chok-tung (played by Dayo Wong) found Huihui. It turned out that Zhongwen died in the hotel that day. Huihui was the last person Zhongwen saw, and she was also his subordinate in the company. She also had a close relationship, so Huihui became the biggest suspect. Even if it was found that Huihui was not the murderer, Mok Chok-tung still pestered her and hoped to get more information from Huihui to find out the truth, which troubled Huihui. Mok Chok-tung also didn't like Huihui's arrogant personality, and the two became a pair of happy enemies. Because of this murder case, their lives intersect again and again. They face difficult cases together and many jokes happen. Unexpectedly, they develop feelings for each other...