Masquerade is a 2012 South Korean period drama film starring Lee Byung-hun in dual role as the bizarre King Gwanghae and the humble acrobat Ha-sun, who stands in for the monarch when he faces the threat of being poisoned.

Lee Byung-hun is a South Korean actor. He has received acclaim for his work in a wide range of genres, most notably Joint Security Area (2000); A Bittersweet Life (2005); The Good, the Bad, the Weird (2008); I Saw the Devil (2010); Masquerade (2012); and the television series Iris (2009) and Mr. Sunshine (2018). His critically acclaimed film Inside Men (2015) won him the Best Actor prize at the three most prestigious South Korean award ceremonies: 52nd Baeksang Arts Awards, 37th Blue Dragon Film Awards and 53rd Grand Bell Awards. Lee has seven films—Joint Security Area, The Good, the Bad, the Weird, Masquerade, Inside Men, Master, Ashfall and The Man Standing Next—on the list of the highest-grossing films in South Korea. Lee was Gallup Korea's Actor of the Year in the Film division in 2012 and in the Television division in 2018. In 2021, he appeared in a recurring role as the Front Man in the Netflix hit survival series Squid Game.