Xu An gives Lu Mingzhou four years of her youth, content to be his secret lover, hidden away from the world. But on her birthday, she is hit with the devastating news that he is engaged to his first love. With her trampled feelings in pieces, she spitefully rushes into a flash marriage with the mysterious CEO Fu Jingshen, then goes abroad with nothing but a contract in hand. Three years later, she makes a dazzling return as Fu Corporation's chief designer. Lu Mingzhou, who once treated her with disdain, is consumed with regret and desperately begs her to take him back. But now Shen Mengqi, a scheming woman, has appeared at Fu Jingshen's side, doing everything she can to drive them apart. As Xu An struggles with the meddling of her former lover and the sabotage of her new rival, she gradually realizes that the man she once regarded as nothing more than a business arrangement had already quietly found his way into her heart through countless nights spent watching over her...