 She creates the Ja-myunggo-gak system, where a magic war drum is placed, to defend the country from outside attacks.Ja-myung and Prince Hodong (Jung Kyung-ho) of the enemy state of Goguryeo fall in love, but Hodong, as an ambitious prince, marries Ja-myung's half sister, Princess Ra-hee, to manipulate her into destroying the nation's defense system.Ra-hee, who is also in love with Hodong, eventually chose to tear down her country's war drum, becoming the traitor - and the princess of the prophecy.