A family story of the wealthy Gu family searching for their biological daughter. Twenty years ago, infant Gu Yueling was maliciously switched and grew up drifting away. Years later, father Gu Zhenhua took her back home on a rainy night, gradually recognizing the bloodline through a brow bone birthmark and her mother's old belongings. Facing the obstruction and forged identification by the imposter Gu Yurou and her accomplices, Gu Zhenhua insisted on investigating, eventually uncovering the switching conspiracy of that year through a second parentage test, allowing his long-lost daughter to return to the Gu family for a father-daughter reunion.