In the early years of the Republic of China, Sergeant Xu (played by Zhang Guoqiang) formed an indissoluble bond with Jing (played by Jiang Zhiguang) of a foreign bank because of a case, and each received an oil painting to commemorate his contribution to solving the case that day. Many years later, Sergeant Xu's descendants are still proud to join the police force, and Xu Xiaoli (played by Yang Yi), who is known as the sharp sister, is a cadre of the police force. After joining the serious crime team, Xu Xiaoli followed her boss Lu Tianheng (played by Ma Guoming) to solve one difficult case after another, and Lu Tianheng's alumnus who has been assisting them with professional physics knowledge is also an associate professor of the university and a descendant of Jing's Jing Bo (played by Lin Feng).
Xu Xiaoli, who was born in a humble background, gradually turned her admiration for Jing Bo into admiration, and Jing Bo also became more and more devoted to Xu Xiaoli, who cared about and took care of herself. But due to the disparity between the two families, the obstruction of his parents made Jingbo decide to give up this relationship. On the other hand, playboy Lu Tianheng and his close friend Min Jia (played by Liao Bier) have always maintained an ambiguous relationship that is also a friend and a lover. Unexpectedly, Minjia suddenly had a lover and wanted to marry him. As there are endless scorching cases, how will the love between these two young couples continue......
