To raise surgery fees for her first love Brody, Cecilia signs a five-year contract with tycoon Harold, becoming the substitute for his white moonlight. When the contract expires and the real white moonlight Vivienne returns, Cecilia is diagnosed with a terminal illness and decides to leave. She soon discovers that Brody’s heroic car accident was a complete fraud staged by himself, and he even plans to sell her for profit. Suffering from severe illness, Cecilia endures Harold’s humiliation, workplace harassment, and repeated persecution from Vivienne and Harold’s family. In her darkest moments, a mysterious masked man saves her repeatedly and gives her warmth. After severe injuries worsen her heart failure, Cecilia passes away in despair. Learning all the truth, Harold collapses completely and takes frantic revenge for her. Miraculously, Cecilia survives with her sister’s heart transplant. Harold recognizes her identity and begins a desperate redemption pursuit. Eventually, Cecilia finds out the masked savior is always Harold. Harold succeeds in snatching her at the wedding, and the two reconcile after all life-and-death hardships.
