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.
This contradicts the widely held belief that Won Gyun had always been plotting against Yi. The show portrays a different narrative where his jealousy and rivalry are revealed later in life as a seasoned commander, marked by his arrogance and refusal to follow Yi's strategies, accusing him of being cowardly and treacherous towards the king.