On the wedding day of Ning Haotian, a wealthy incense maker, his fiancée Xiang Xueyin eloped with his junior brother An Qiusheng. The maid Suyun pretended to be a young lady and married into the Ning Mansion. Later, she gave birth to a pair of twins - son Ning Zhiyuan and daughter Ning Peishan, who were born without the sense of smell. Xueyin gave birth to a baby girl with a strange scent, named An Ruohuan, who accidentally drank poison to save her husband and died. An Qiu Sheng mistakenly believed that Mrs. Wen's wife had indirectly killed her lover, so she kidnapped her son Wen Shiqing and renamed her An Yichen; Mrs. Wen's Songxian, who was divorced because her son was missing, met An Ruohuan when she was committing suicide, but the housekeeper of the Ning family couldn't bear to kill him and let him go. She gave up her suicide and decided to raise him. Several people invariably used "Wangyou Incense" on the children, erasing their past memories. Twelve years later, several cases of missing girls occurred in Mowangling. Yichen went to Mowangling to solve the case. In fact, he followed Qiu Sheng's arrangement to "revenge" and took the opportunity to bring down the Wen family and the Ning family. Yichen seeks help from his Japanese classmate Keiko. Unexpectedly, Keiko's father Taro not only wants to seize the incense book, but also wants to annex Demon King Ridge in one fell swoop. An Leyan went to work in the Ning family and became happy friends with Ning Zhiyuan.