Sungnyang disguises herself as a man and works to free women who were sent to be Yuan concubines. King Wang Ko orders Sungnyang to get close to Wang Yu to lure him into an ambush.

Sungnyang reveals to the Crown Prince that there is a spy among them. Prince Togon is exiled to Koryo.

To Gon reveals he's the Yuan crown prince, but Sung Nyang kicks him in the leg; Ba Yan hears that To Gon has been killed and goes to inspect the corpse but is shocked at what he finds.

The Yaun Prince asks Sungnyang to teach him how to defend himself. El Temur plans a full-on attack on Daechong Island in order to kill the prince.

Sungnyang and Prince Togon continue their way to Kaegyong to find the Koryo King; El Temur takes Koryo's palace under his command.

Yom falls for Sungnyangs trick and brings in Prince Togon's body into the palace. Prince Togon becomes conflicted about choosing to tell the truth or becoming emperor of Yuan.