word unit. Korean country names such as Joseon, Buyeo, Koguryo, Baekje, Silla, Gaya, Balhae and Gorye ... belonging.In Chinese history books such as during the Dang Dynasty, Koguryo, Baekje andSilla are c ... my mail, and review this problem.First of all, the name of the country ‘Koguryo’ is different from