The 10th Volume of "The History Book of Goryeo (Goryeosa)". The Iron Forge village that was abandoned by the Nation, defeated the strongest army in the world, the Mongols. Iron forge village is full of refugees, weapons, and iron. In front of the village, there’s ‘Mongke’, the Mongolian General, and hundreds of Mongol Army who follow him to destroy The Iron forge village. A daredevil from the Iron forge village called ‘Ji Gwi’ and a cold young general ‘Oh Sa Hwa’. Two completely different people, from their status to their personality. Together, they must unite their strengths and stop the Mongols, but everything is a conflict. In the end, will Dain Iron forge be safe from the Mongol invasion? Can Ji Gwi and Oh Sa Hwa defeat the brutal Mongols?