Taejong, the father of King Sejong, uses his power and authority over his son against his enemies, including Sejong's father-in-law.

Sejong's small act of defiance triggers a massacre, as well as an outrageous request from his father.

Sejong and his father enter into a battle of wits as young Ddol Bok attempts to survive inside the Slaves' Quarters.

Ddol Bok becomes a palace officer, going by the name Kang Chae Yun in an attempt to move closer to the king.

Tasked with looking into the recent slew of murders, Chae Yun is confronted by an assassin with skills that match his own.

Sejong is devastated by the death of another scholar, while possessing the key to the scholar's final message.