Su Wanning lives under someone else’s roof as the docile adopted younger sister of the Lu family, while secretly harboring a forbidden love for Lu Chengxiao. She silently stays by his side, hoping for even the smallest sign that he might return her feelings. At the family birthday banquet, he steps in to protect her, and a glimmer of hope appears, only to be shattered moments later by his grandfather’s coma and the mystery surrounding her birth. The Lu family accuses her of being the daughter of a traitor, and he personally drives her out into the rainy night. In tears, she cuts off their relationship. With Shen Muyang’s help, she finds a stable footing, while Lu Chengxiao is consumed by regret after uncovering the conspiracy. By the time he clears every obstacle and comes looking for her, the once-timid adopted girl has transformed. This passionate, forbidden love finally finds its answer in a secret marriage, fulfilling his belated devotion and promise to protect her.
