The Evil Twin (2007)

After ten years in a coma, So-yeon finally wakes with no memory of the accident that changed her family forever. Her twin sister, Hyo-jin, drowned in the same tragedy that left So-yeon unconscious, but the past remains a blank. As she tries to return to life, unsettling incidents and unexplained deaths begin to surround her, pointing toward a dark secret that still haunts her home.