Tree With Deep Roots (2011)

Synopsis:
This slickly produced and richly embellished historical thriller offers a satisfying blend of truth and fiction that makes the court antics of Henry VIII look like Mickey Mouse. The story takes place in the imperial palace of King Sejong who has taken on the task of creating a new written alphabet for Korea. Helping him is So Yi, a beautiful mute lady of the court. When a series of palace scholars are murdered, a lowly guard named Chae-yoon decides to investigate—and soon uncovers a dark, labyrinthine conspiracy run by a shadowy group of powerful men.


Source: www.anisearch.com/movie/15906