Yi In (Cho Jung-Seok) is a prince. His older brother is King Yi Sun, who cares about him a lot. Vowing loyalty to his older brother, Yi In is taken hostage by the Qing Dynasty. King Yi Sun soon views his younger brother's loyalty as betrayal and begins to hate him. Yi In endures deep emotional pain because of this. Yi In then meets an unknown baduk player who wagers on her games. He is completely fascinated by the baduk player. Through circumstances, Yi In becomes the king. He holds the highest position and is a strong person, but he is sad and weak internally. When Kang Hee-Soo (Shin Se-Kyung) was gaining fame as an unknown baduk player, she met Prince Yi In and fell in love with him. Through a vortex of fate, she becomes a spy. She approaches King Yi In to get her revenge.