After being blinded in a coup against the king, Joseon's greatest swordsman goes into hiding, far removed from his city's anguish. But when traffickers kidnap his daughter, he has no choice but to unsheathe his sword once more. Three different swordsmen -- a swordsman who is going blind, the best swordsman in Joseon Dynasty, and the best swordsman in Qing Dynasty who aspires to be the best even in the Joseon Dynasty -- meet each other for their own reasons.