Cadaver (2006)

Mai is a medical student who has a scary experience while working with an experimental cadaver while doing her anatomy research. After this, she becomes haunted by a woman ghost that keeps following her everywhere. While Mai is terrified of the fearsome ghost, her teacher, Dr. Prakit, is the only person who is willing to try and help her. But, when she deeply discovers the truth behind this unknown cadaver, it leads her to find a horrible story of a girl called Dawan who is somehow linked to the cadaver.