Silence or Death.

Shadows in the Palace (2007)

Directed by Kim Mee-jeung

Upon receiving the body of a maid in waiting who was said to have hung herself within the palace walls, dedicated doctor Chun-ryung begins to suspect foul play. Upon launching a personal investigation, however, Chun-ryung quickly discovers a labyrinthine maze of deception constructed by those with limitless power to conceal a valuable secret.