The eldest son of Sanung, the head of Arthdal union. At the age of 18, he leads the war against Neanthals into success, showing his brilliant talent and war skills. But his desire didn't stop there - he even conquered victory over his own father, taking over Arthdal instead. Soon, as he reaches Iark to expand his territory, he meets Eunseom - a rival who he didn't think that existed.