One Man Agency

(MASSIVE SPOILERS FOR SOLO LEVELLING) It was over. He had won. The battle against the monarchs came to an explosive finish, one which granted a reward unlike any other, a chance to set it all right, until it was stolen from him. Now here he was in the body of a child, finding himself needing to level up once again. (Crossover with solo levelling obviously, with sung replacing Deku)