Kim Taehyung, a nerdy student of Saebom High experiences some mysterious event that he will go back to the past. More specifically, in the Joseon era, and will eventually lead him to Jeon Jungkook, a prince of the Joseon Dynasty and in time, he will be a candidate as the King of Joseon. Before this, Taehyung tried to end his miserable life at the Han river and after that unfortunate event, when he woke up, he finally realized that his surroundings were not the Seoul he knew.