

Though it places his own life in danger, a look-alike commoner secretly takes the place of a poisoned king to save his country from falling into chaos.
Acting
Lee Byung-hun plays two men who become each other—stunning duality
Production
Gwanghaegung Palace rebuilt with obsessive historical accuracy
Writing
Script inspired by a single ambiguous line in royal records

Director
Choo Chang-min
Trivia, insights & behind the scenes
Lee Byung-hun reportedly asked the director which twin he was playing in each scene to maintain psychological consistency.
The real Gwanghae was the only Joseon king not given a temple name—historically erased, making Ha-sun's fictional sacrifice weirdly poetic.