Return of the Legendary Hunter

Woojin spends ten years hunting for the sister who vanished the same night their parents were murdered, and that search drags him into a world hiding just under this one, full of monsters and beings ordinary people walk past every day without knowing it. He finds her too late, watches her become the final sacrifice in a ritual meant to drag down a god, and dies right there trying to stop what's already happened.He wakes up back on that same first day, ten years earlier, except now he remembers everything, every ally worth trusting, every enemy who was never actually hiding, every step that led to that ritual. He tells his father at breakfast, "something's wrong, we need to leave the house tonight," and walks out the door already fighting a war his family doesn't know exists yet.His body's young again but nothing else about him is, and every move he makes to save his sister pulls back a curtain on a conspiracy.