A modern couple is transported to ancient times after a car accident! On the outside, they appear to be a cold and aloof prince and a refined young lady from a prestigious family, but inside, they are still modern souls. Secretly testing each other to figure out one another's identities, they introduce milk tea, develop urban infrastructure, and take on outdated feudal ideas in all sorts of creative ways. They outwit schemers, resolve crises, and stir up hilarious chaos. From mutual suspicion to finding their way into each other's hearts, they build successful careers, find love, and achieve a happy family life in this strange new world.