Yoon Se-ri, a South Korean chaebol heiress, crash-lands in North Korea during a paragliding accident and is discovered by Ri Jeong-hyuk, a principled North Korean officer. To protect her, he hides her in his home under the guise of being his fiancée, while he and his loyal unit attempt multiple failed plans to send her back across the border. As Se-ri and Jeong-hyuk grow closer, they face surveillance by State Security officer Cho Cheol-gang, complications involving Jeong-hyuk’s real fiancée Seo Dan, and the reappearance of Se-ri’s ex-fiancé Goo Seung-jun, who is hiding in North Korea under a false identity. The story follows whether Se-ri can return home—and whether love can survive separation, politics, and fate.