Koryo kingdom fell into complete dependence on the Yuan Empire. Under the pretext that the Koryo monarch has no heirs, the emperor demands his cousin to be the next on the throne of a small kingdom. And an ancient Koryo dynasty has no heir due to the fact that the head of the state is much more interested in the head of the guards than the queen herself. But knowing that the birth of a son is the only chance to retain power, he persuades his lover on an intimate relationship with the Queen.