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Nae-gyeong (Song Kang-ho), the most skillful face reader in Joseon dynasty. He can see through people by looking at their faces. After alluring courtesan Yeon-hong (Kim Hye-soo) proposes an offer, he moves to Hanyang to read faces in the courtesan house. Nae-gyeong read the faces of Yeon-hong's guests only to get involved in a murder case. With his face reading skills, Nae-gyeong successfully identifies the murderer and his skills are soon acknowledged by King Munjong who orders him to identify the potential traitors who threaten his reign. However after the unexpected death of King Munjong, Nae-gyeong is courted by Grand Prince Su-yang who yearns to become King himself by killing the young successor Danjong. Nae-gyeong decides to keep his loyalty to the late King and help Kim Jong-seo protect the young King and change the destiny of the country by changing what's written on Prince Su-yang's face, which forces him into the biggest power struggle in the history of the Joseon dynasty...