Don't Wake the Runt. He Is the Dragon King

Aiden once ruled as the Silver Dragon King, a legendary being who sealed away a looming world-ending doom and gave up his life to do so. Now he has been reborn as the feeblest runt of his family, a child whom everyone overlooks and underestimates. Hidden beneath that frail appearance is the mightiest power the realm has ever known, but he must guard his true identity while the people around him still see only a weakling.