Heartbeat Deadline

Jin Haneul, a stuntman-turned-action-star infamous for his cynicism, is at his grandfather's deathbed when he's given an ultimatum: marry within three months to inherit the Chaebol empire, or it all goes to his ruthless cousin. His grandfather's pick for a bride? Chae Rina, the nation's beloved K-pop idol, whose sunny disposition is a shield for her own desperate need to escape her exploitative agency. They agree to a one-year contractual marriage, a simple business deal. But forced proximity in a penthouse apartment under the constant glare of the public eye blurs the line between performance and reality. As they fend off paparazzi and malicious rumors together, a genuine partnership forms. Then the threats turn deadly. They realize the inheritance isn't just money - it's control of a corporation with dark secrets, and their fake marriage has made them the primary targets in a silent, high-stakes battle for power. With a double agent in their midst and a hidden clause in their contract counting down to an unknown, fatal deadline, can they survive the performance of a lifetime?