The Former King Taejo aggressively gathers his army with Jo Sa Eui as the commander. Although Bang Won couldn't believe it at first, he quickly realizes the danger and assembles his army. Bang Won and Bang Gwa swore to never spill the blood of their family again. However, they both know that their father will not stop until he gets Bang Won's head. Now, the grand war that will decide the true king of Joseon begins.