A woman determined to build her own fortune accepts any opportunity except theft, murder, and kidnapping—making a shocking decision when she signs a 90-day contract marriage with a ruthless billionaire. Haunted by past betrayals and convinced all men are selfish, she enters the arrangement purely for financial gain, never expecting her carefully constructed walls to crumble. He's the powerful heir to Rainbow Company and CEO of one of the nation's most dominant corporations. Bound by a deathbed promise to his grandmother, he needs a wife—fast. When fate orchestrates their meeting, neither anticipates the dangerous chemistry that ignites between them. As ninety days countdown, a possessive billionaire refuses to let go, and a guarded woman discovers that vulnerability might not be weakness. But with kidnapping threats looming and secrets threatening to surface, their contractual arrangement becomes dangerously real. Will their temporary marriage survive the collision of ambition, trust, and unexpected love?