When her sister ran away from marriage, Qian Niannian was forced to put on a wedding dress as a substitute. Everyone said that Gu Jingchen was a cold-blooded monster who threw her an agreement on the first day after marriage. Qian Niannian kept to herself as a substitute, but late one night she bumped into him alone in the study, repeatedly looking at a yellowed photo - the little girl in the photo looked exactly like her when she was a child. The stand-in Bai Yueguang broke the mirror and returned to Yuanwen. The female protagonist is willing to be a substitute but does not know that she is Bai Yueguang herself. The male protagonist has been looking for his first love for many years before he realizes that he is right in front of him. Delicately depicts secret love and protection.
