One day, Joo Kang-hyun, a stranger who fell into the world of martial arts, rose to the position of Heavenly Demon after going through countless hardships. However, he always missed his hometown, the 21st-century Republic of Korea. He thought he would return to his hometown once the proper array was activated, but instead, he regressed to the past. Gosh... The Heavenly Demon, Joo Kang-hyun, went back in time! In order to save the Youngrae Tavern which was on the verge of bankruptcy, he cooked delicious Jajangmyeon and Jjamppong! This tavern was the place where he lived with the three siblings who took care of him when he first entered Murim, Soran, Doran, and Unyoung. Although their business was not going wel, they lived happily in their own way. In the future, after he became The Heavenly Demon, he heard news that their lives all ended miserably. He planned to stop their misfortunes himself. How? With Future Vision, Demon Lord Qi and Black Bean Soup!