Nae-kyeong (Song Kang-ho, Snowpiercer) is the greatest face reader the royal court has ever known. He can see through people by looking at their faces, a skill that brings him to the attention of Vice Premier Kim, who appoints him to the government’s Inspection Board. During his inspection, Nae-kyeong finds out about Prince Su-yang’s plan to take the throne of his nephew. He decides to change the destiny of the country by changing what’s written on Su-yang’s face.