In order to repay Su's father for saving his life, Fu Chengyu raised the orphan Su Wan as his "brother-in-law" and secretly paved the way for her. Su Wan didn't know Fu Chengyu's true strength and only regarded him as an ordinary businessman. She became rebellious against his long-term strict control and opened a shop independently.
Fu Chengyu developed feelings for Su Wan that transcended responsibility during many years of getting along, but he could not admit it due to the shackles of his love and identity, so he used the excuse of "looking for Luna, the designer of White Moonlight" to surround Su Wan as a "stand-in". While Su Wan hid her identity as Luna, she endured the humiliation of being a "substitute". The two kept getting closer amidst trials, pulls, and misunderstandings.
In the end, when Su Wan's vest fell off, Fu Chengyu discovered that the person he was looking for was always by his side, and his past kindness was entangled with his current love. Su Wan also experienced emotional suffering, and finally achieved self-growth, and reached true reconciliation and love with the male protagonist.
