Prince Yeongchang passed away at a young age without ever learning what real love feels like. Jade pities him and reincarnates him, but being the loser that he is, he is unable to date anyone. Then an announcement is made in the underworld: only one person can reincarnate due to overpopulation on Earth. The mission is dating, and now everyone must play a vital role to help Yeong Chang find a girlfriend. King Sejong, King Seongjong, and King Yeonsan set out for their reincarnation and to help Yeong Chang find success in his dating life.