In her quest for revenge, Xia Mang deliberately approached the eldest son of the Zhou family, Zhou Jingyu, only to unexpectedly share a one-night stand with him. When they meet again, Xia Mang has become the long-lost daughter of the Zhou family and he has turned into her "brother." To survive in the treacherous Zhou household, she has no choice but to cling to her "brother" and seek his protection.