(Marriage change + time travel) A short story. The modern social horror programmer Cheng Yan (27 years old) accidentally time travels to the Yingtian Mansion of the Dayong Dynasty, Cheng Guogong's Mansion, because of an ancestral bronze mirror, and his soul passes through the fifteen-year-old legitimate daughter Cheng Yanzhi. From a "social animal in a cubicle" who typed codes to a noble girl who wanted to learn to be a prostitute, manage children, and negotiate marriages, in the process of adapting to the ancient identity, she gradually unlocked the thousand-year secrets of the Cheng family and the bronze mirror. She and her childhood sweetheart Gu Yan, the eldest son of the Gu family, changed from "brother and sister" to "husband and wife", and finally completed the dual transformation of gender recognition and self-worth.