Lee In is the King of Joseon whose name is tainted with rumors and infamy. Since childhood, Lee In noticed how the people treated him differently, believing he was favored by the King. When he ascended to the throne, he was continuously seen as an immoral figure, accused of poisoning his brother and a power-hungry tyrant who plunged the kingdom into chaos. Kang Hee-su was raised by a patriotic father, Kang Hangsoon. When she played in the game of go with Lee In, she falls hard for him. But when Lee In ascends to the throne, he betrays her trust. Hee-su vows to seek revenge against him.