Pei Zhirou fell from a building as a child and went missing, leaving her biological mother Fang Xinxin in endless grief. Years later, Zhirou clashes with Fang Lang, Xinxin's son, and is humiliated by the Fang family—even her adoptive mother is nearly beaten to death. When the Fangs force her to undress, her birthmark is revealed, exposing her true identity as the long-lost daughter and shocking everyone present.