Because of the incident at Huachao Tower, Li Mengjue and Xie Jingshu became a "hundred-day couple" bound by contract. In the eyes of outsiders, they were deeply in love, like cranes and butterflies flying together. Li Mengjue was dignified and elegant, giving the respect of a legitimate wife. Although Xie Jingshu was disabled, he was considerate and gentle. But who knew that the two had hidden evil intentions and plotted against each other. Li Mengjue was originally a scout under the Soul Soul Sect, and he sneaked into Huachao Tower to investigate the "Tianshu Case". Xie Jingshu even kept his identity as Dingbei Hou strictly secret, pretending to be a wealthy businessman. Until one dark and windy night, the two looked at each other with a smile, and Li Mengjue was exposed. The couple who pretended to be in love in the past instantly removed the last layer of disguise. However, the clues to the truth of the frequent murders at that time all pointed to the past events of the massacre in the city and the Tianshu case. Forced by the reality of pursuing the same goal, the two reached a short-term alliance and embarked on a journey with Lu Xier, Jing Yan, and Liu Yu'an to find the "snow on the branch of wormwood" and catch the traitor...