Won Gyun
Instead of vilifying Won Gyun, a Korean admiral who contributed to the jailing of Admiral Yi for jealous reasons, Won Gyun is portrayed as a strong and smart, but very hot-tempered man who befriends and leads Yi throughout his early life. This deviates from the common belief that Won Gyun had always conspired against Yi. In the show, his jealousy and rivalry is portrayed in his later years as a veteran commander when he begins to show his arrogance as one of Joseon's strongest warriors, refusing to follow along with what he deems to be Yi's cowardly tactics and treachery to the king. His betrayal to Yi is explained through the show's ongoing politics and his inability to distinguish military merits from protection of the people. There is much debate about this positive portrayal of Won Gyun as recent research suggests that he may have been excessively vilified during the Park Chung-hee administration. Reception and reviews have since been positive with much praise for the show's emphasis for humanity and their portrayal of Won Gyun.