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.
Alone in a bar, college student Bert meets Ken, and the two have a one-night stand. Later, Bert discovers that Ken was his teacher of a class that he failed. Not only that, Ken is even the fiancé of Bert's sister-in-law. They plunge into a forbidden love affair, and family conflicts exacerbate things.
A fallen Nine-Tailed Fox God searches the mortal world for his reincarnated lover, only to cross paths with a college student whose fate is deeply entwined with his past and the price of defying heaven.