At the center of a dazzling charity gala, Yoon Seo-ha shines as the beautiful, adopted daughter of a powerful politician. Yet behind her flawless facade lies a crushing reality—blind and entirely dependent on her adoptive family, the glamour is nothing more than a golden cage keeping her trapped.

Desperate to escape her living hell, Seo-ha makes a dangerous gamble, offering a deal to Han Jun-hyuk—her arranged marriage partner and a notoriously uncontrollable corporate “mad dog.”

“Marry me,” she proposes calmly. “In return, I’ll make sure I die so I never become a flaw in your life.”

Bound by a deadly vow, two broken souls enter a precarious marriage built on a promise of death. But as hidden motives unravel and dangerous desire ignites, will their bargain lead to ultimate destruction, or an unexpected salvation?