Childhood Friend of the ZenithCheonhajeirin-ui Sokkupchingu; 천하제일인의 소꿉친구; Друг детства сильнейшего воина; Лучший друг детства на свете; Друг дитинства найсильнішого воїна; Найкращий друг дитинства у світі; Przyjaciel z dzieciństwa najsilniejszego wojownika; Najlepszy przyjaciel z dzieciństwa na świecie; صديق الطفولة لأقوى محارب; أفضل صديق طفولة في العالم; 天下一品の幼なじみ; Shadow of the Supreme; Les amis d'enfance inegalés; Amigo de infância do Zênite; Childhood Friend of the Zenith; Thanh Mai Trúc Mã Của Đệ Nhất Thiên Hạ; The best childhood friend in the world

Gu Yangchun, who betrayed the Orthodox sects, became a demonic human under the Heavenly Demon. Living as a demonic human, he led a life filled with regret. He committed countless evils not of his own accord, but under the orders of the Heavenly Demon. In the Great Orthodox-Demon War, thanks to Wi Seol-ah, who cut down the Heavenly Demon that made even the three supremes of the Orthodox forces kneel, Gu Yangchun was taken prisoner by the Orthodox forces and suffered for his sins. With whatever morals he had left in him, he died giving Wi Seol-ah information about the Demon Cult due to a bind the Heavenly Demon had placed on him. Then, for some reason, Gu Yangchun regressed to when he had first met Wi Seol-ah. Realizing the regression was not a dream, Gu Yangchun decided to live a quiet life. However, bad ties from his previous life began to draw near, one by one.