Masquerade

Gwang-hae, wang-i doin nam-ja is a movie starring Lee Byung-hun, Seung-ryong Ryu, and Han Hyo-joo. A look-alike commoner is secretly hired to take the place of a poisoned king to save his country from falling into chaos.
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.