Bannohwandonghan Cheonmaui Magyeongbangsong

Chi Yu-rang, the Cheonma and greatest martial artist of his era, is imprisoned by an unexplained force on an island called Magyeong. Ten years of isolation later, a strange device informs him that four separate worlds have fused together. To reach the outside and stay alive, he chooses to reverse his own aging, and comes back as a lovely young Heavenly Demon girl now known as Cheonma-chan. The question is whether she can win over Kwitch and find a way out of the Demon Realm.