Born as a concubine's child, Gwang Hae (Seo In Gook) was proclaimed as an heir to the throne. Gwang Hae suffered from the threats of dethronement and assassination for 16 years because of his background.
This drama is the epic of Prince Gwang Hae who used face-reading skills as his weapon to overcome his destiny and become the king.
And there is a woman (Jo Yoon Hee), beloved by both Gwang Hae and his father King Seon Jo (Lee Sung Jae), who denied himself to qualify for the throne.
Because Prince Gwang Hae was able to read others' faces, he succeeded to govern the Joseon Kingdom.