Mallep Yeongungnim Kkeseo Gwihwan Hasinda!

A prince is struck by an enemy arrow and falls into a coma. His soul is taken to a place where legendary heroes reside. Over a thousand years, he endures intense training under their supervision, growing into an extremely powerful hero. When he returns to his original time, he awakens in his kingdom, now possessing immense strength. Those who once underestimated him must now face the reality of his transformation.