Lee In is a prince. His older brother is King Lee Sun, who cares about him a lot. Vowing loyalty to his older brother, Lee In is taken hostage by the Qing Dynasty. King Lee Sun soon views his younger brother's loyalty as betrayal and begins to hate him. Lee In endures deep emotional pain because of this. Lee In then meets an unknown baduk player who wagers on her games. He is completely fascinated by the baduk player. Through circumstances, Lee 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 was gaining fame as an unknown baduk player, she met Prince Lee In and fell in love with him. Through a vortex of fate, she becomes a spy. She approaches King Lee In to get her revenge. (Source: AsianWiki)