Hailey is an unloved adopted daughter in the Coleman family and treated like a servant. After her sister Vivian elopes with her lover, the Colemans force Hailey to marry wealthy heir Nate, threatening to abandon her seriously ill adoptive father. Helplessly, Hailey walks down the aisle. After marriage, she discovers Nate is not the frivolous heir rumored to be. Sharp and powerful, he is the true controller of the Grant Group, secretly investigating the Colemans’ financial fraud. Drawn to Hailey’s resilience and intelligence, Nate gradually falls for her amid their tense interactions. When Vivian returns to provoke her repeatedly and the Colemans keep scheming, Vivian exposes Hailey’s forced marriage at a family dinner. Heartbroken, Hailey also realizes Nate used their marriage for investigation. Believing she was merely a pawn, she leaves him. Determined not to be dependent on others, Hailey gathers criminal evidence against the Colemans and officially teams up with Nate. At the shareholder meeting, Hailey exposes the family’s crimes while Nate reveals his true identity and freezes their assets. The Colemans and Vivian are arrested on the spot. Hailey builds an investment firm with her compensation. At the opening ceremony, Nate kneels down to propose again. "You married me for someone else last time. This time, choose me for yourself." With tears in her eyes, Hailey answers, "I do."
