Masquerade 2012 (South Korea), also known as Gwanghae: The Man Who Became King, Gwanghae, Wangyidoen Namja is South Korea drama premiere on Sep 13, 2012
Amid national chaos and fear for his life, tyrannical King Gwang Hae orders his trusted councilor Heo Kyun to find a royal body double. He hires Ha Seon, a peasant mimic who bears a perfect resemblance to the King. When King Gwanghae collapses from a mysterious poison, Ha Seon reluctantly becomes a King. He must follow his conscience to save his country from collapse, avoid assassination, and pull off the biggest masquerade in history. (Source: CJ Entertainment)