Geom Mugeok, the overlooked and underestimated second son of the legendary Heavenly Demon, watched his entire world crumble when the unstoppable Hwa Moogi brought the Murim to its knees. Having survived the initial slaughter only to live as a broken, one-eyed wanderer for decades, Mugeok refuses to let the shadows of the past define his end. He executes the forbidden Great Regression Technique, sacrificing everything he has left to awaken in the body of his younger self, back when the Heavenly Demon Divine Cult was still at its peak. Now, he is no longer the "incompetent" young master everyone remembers, but a man armed with a lifetime of experience and a desperate need to rewrite a history written in blood.

Also known as Jeoldae Hoegwi, this high-stakes martial arts epic follows Mugeok as he navigates the lethal politics of his father’s cult while preparing for the inevitable arrival of the man who once ended the world. While his external battle involves outmaneuvering ambitious rivals and mastering the blade, his true internal struggle lies in learning to trust again and opening his heart to the family and friends he once lost. The fateful realization that he cannot save the future through raw power alone shifts his path, forcing him to mend fractured loyalties and lead with a newfound sincerity that his previous self never possessed. Driven by a fierce love for those he failed to protect, Mugeok is determined to stand as the ultimate shield against the coming bloodtide, forging a new destiny where every soul he treasures remains by his side.