The versatile actor Lee plays the dual lead as both the tragic King Gwang-hae and that of the commoner who shares a fatefully remarkable resemblance to the ruler, Ha-Seon. Deeply embroiled in palace intrigue which aims to assassinate the ruler, King Gwang-Hae orders his trusted councilor Heo Kyun to find him a body double. When the King collapses from a mysterious poison, Ha-seon must carry off the biggest masquerade of his career to save the country from chaos while under imminent threat of death.