To repay Su Wan’s father for saving his life, Fu Chengyu raises the orphaned Su Wan as her “uncle” and quietly clears the path for her. Su Wan knows nothing of Fu Chengyu’s true power. She assumes he is an ordinary businessman and rebels against his long-standing strict control by opening a shop and living independently.
Over the years, Fu Chengyu develops feelings for Su Wan that go beyond a sense of duty. But bound by the debt he owes her family and by their relationship, he can’t admit how he feels. Instead, he uses his search for “Luna, the designer who was his first love,” as an excuse to keep Su Wan by his side, treating her as a “substitute.” Su Wan conceals her secret identity as Luna while enduring the humiliation of being a stand-in. The two grow closer through testing each other, emotional push and pull, and misunderstandings.
At last, when Su Wan’s secret identity is exposed, Fu Chengyu realizes that the person he has been searching for all along was right beside him. The debt he owes her family and his love for her are hopelessly intertwined. After enduring the torment of their relationship, Su Wan ultimately grows into her own person and reaches a genuine reconciliation and loving relationship with the male lead.
