Joo Yoo-Rin has survived on lies, charm, and quick thinking, thanks to a lifetime of dodging debt collectors and cleaning up after her reckless father. When she meets Seol Gong-Chan, a wealthy hotel heir desperate to fulfill his grandfather’s last wish, her life takes an unexpected turn. Gong-Chan asks her to pose as his long-lost cousin to bring peace to his ailing grandfather, offering her a sum of money she can’t refuse. The fake family arrangement evolves into a complicated relationship as real feelings start to form between them—feelings they’re not supposed to have. As their secret stretches on, the entanglements only deepen. Gong-Chan’s best friend, Jung-Woo, falls for Yoo-Rin, while Gong-Chan’s elegant ex-girlfriend, Se-Hyun, refuses to let go of the past. As love triangles close in and buried truths edge closer to the surface, Yoo-Rin and Gong-Chan are forced to face their true emotions and the consequences of a lie that’s no longer easy to undo.