In a realm dominated by martial prowess, Un-Seong witnesses his master's unjust demise due to false allegations of dabbling in forbidden demonic skills. Despite a fierce battle, he falls short in avenging the unjust act and meets his supposed demise. However, fate intervenes, granting him a second chance at life. Resurrected as a youth, he undergoes training to become an elite warrior for a demonic faction. Now, Un-Seong must grapple with the dark arts and wield their power as he embarks on a vengeful journey like no other.