Six hundred years ago in Joseon, Prince Gyeom is falsely accused of treason and pushed to the brink of death. After throwing himself into a lake, he wakes up in a bathroom in South Korea in 2025. Suhyeon, the homeowner and a fiercely capable TV drama producer, is shocked to find a mysterious man in her home. But when her rent suddenly doubles, she makes a deal with reality—and decides to earn money together with Gyeom, the prince from the past. Their unexpected cohabitation begins.