The soldier king Xiao Tianluo traveled through time and became an orphan in Dachu. In preparation for the martial arts examination, he applied for a job as a guard at the Xuanwu Marquis Mansion. However, he unexpectedly had a relationship with the "sickly" eldest daughter Zhu Jiuer, and was forced to marry into his wife and sign a "three-year divorce" agreement. After the marriage, he discovered that Zhu Jiuer looked weak but was actually strong, and had been secretly investigating the mystery of his parents' disappearance. Xiao Tianluo relied on modern knowledge to invent soap and scented soap, save the declining business of the Hou Mansion, expose corruption on Zhuangzi, and thwart the prince's conspiracy. However, he unexpectedly learned that the person behind the scenes was Zhu Jiuer himself, who had chosen him to avoid the royal marriage. Faced with deception and the crisis in the Hou Mansion, Xiao Tianluo chose to join forces with her to fight against the imperial power.
