Manga Like Sacheondanggaui Mangnaettareul Napchihaetda

To escape hunger, Cheon Hwi took up the sword and eventually rose to the realm of a supreme master, earning the title of the Sword Ghost. Then came the Heavenly Demon, the greatest martial artist in history and a calamity feared throughout the Jianghu, plunging the Central Plains into ruin. Cheon Hwi met Tang Sowol, the Poison Empress of the Sichuan Tang Clan, who was left utterly alone after the Heavenly Demon slaughtered her entire clan. Bound by their shared desire for vengeance, the two fought side by side to kill the Heavenly Demon However, their blades never reached their target, and they met their deaths together on the same day, in the same place. "If only I had possessed a little more talent." "If only I had had a little more time." "If only I had mastered stronger martial arts." As his life ends in bitter regret, Cheon Hwi regresses 20 years into the past. Having swiftly regained the strength he once possessed, the now-young Cheon Hwi vows that this time, he will protect her no matter what. So he seeks out Tang Sowol, just as she is about to step into the martial world at nearly twenty years of age... ...and kidnaps her. (Source: Naver, translated)