He Goes Back 15 Years to Unlock LEGENDARY Weapons Before Anyone Else New Anime

Deep inside an ancient ruin, a team of explorers is lying in the puddle of their own blood. The only survivor is Juheon, or Sung Jinwoo from Walmart, a talented swordsman who has not yet given up against the insanely powerful enemy that killed his entire team. He holds his sword in his trembling hands as a giant snake monster raises its head to attack him.