Yeuh-Reum and Hyun Moo-Heum are polar opposites. Moo-Heum is a promising and fortunate young man born into wealth; his father oversees a major multinational corporation. In contrast, Yeuh-Reum is an average woman facing the challenge of repaying a staggering debt of 70 million to none other than Moo-Heum. Their lives take an unforeseen turn when a mysterious stranger appears, introducing an element of uncertainty that could either remedy or intensify their already tumultuous circumstances.