Jin Seo-jun, a delivery driver who devoted himself to his ex-wife only to be cruelly abandoned, happens to save the granddaughter of a chaebol chairman—and the company's CEO—on the very day of his divorce. He enters into a one-year contract marriage with her, So Chae-won. His furious ex-wife and second-generation chaebol Ha Jae-hyun team up to frame him with every dirty trick imaginable, but Jin Seo-jun uses his hidden abilities to give them a satisfying dose of reality. Having achieved a complete life turnaround all on his own—without any help from his in-laws—Jin Seo-jun hard-carries the So family through their crisis and seizes both honor and love.