Natre, she screws up all your photos, only to ride your back like the devil (Shutter)

Natre is the main antagonist of the film Shutter directed by Banjong Pisanthanakun and Parkpoom Wongpoom and released in 2004 in Thailand.

* SPOILER ALERT* 

You have been warned

A tragic love story between a young man nammed Tun, working as a photograph, and the vengeful spirit of Natre, her former lover, who decided to haunt him for breaking up with her.

Here is Tun - played by Ananda Everingham -

Here is Natre (ghost form) - played by Achita Sikamana -

Plot of the film

After drinking with close friends, Tan and his girlfriend Jane hit a girl on the road. Too scared to check her, Tun orders Jane to continue driving. Several days later, Tun discovers that his photos contains mysterious white shadows. Jane thinks that it is the ghost of the girl who is haunting them.
Meanwhile, Tun begins to suffer several neck pains and discover an ominous girl on his photos.
He and Jane hear later that their friends commited suicide, saying that a girl was haunting them.
Tun reveals that he had a former girlfriend named Natre and decides to go see her, in hopes of solving his problems.
Arriving at Natre's house, they discover her mother who was keeping the corpse of her beloved daughter since she commited suicide after being left by Tun. After convincing her to let Natre's body get cremated fo proper funerals, everyone thought that it was finally over.
However, one night when Tun and Jane were sleeping, Natre begins to pursue him through his apartment, eventually making him fall from several floors. He survived with little injuries and assisted with Jane to Natre's cremation.
Her spirit however is still active and indicates Jane to discover negatives of photos that Tun hidden between many others, showing Natre being raped by Tun's gang.
Horrified by Tun's secret, she quits him afterwards. Devastated and filled with anger, Tun shouts to Natre to show herself, grabs the polaroid

The vengeful ghost in Shutter

Natre's ghost represents the wrath of a heartbroken woman who did not want to loose the only one who came at her while she was in great despair. She became in the film the personnification of the past that comes haunting its victims, those who did something wrong and tried to forget it, only to realize with horror that the past returned to claim vengeance.
Killing her rapists one by one, haunting them through the tool that was used to humiliate her: the camera that forever immortalized the nightmare she lived that night.
Now, she remains forever close to Tun, on his shoulders, until he dies, as a punition for abandoning her.

The moral of this story: "Don't be an asshole".

Sources:

http://joevilayrath.blogspot.fr/2013/03/shutter.html
https://en.wikipedia.org/wiki/Shutter_(2004_film)
http://www.horror-extreme.com/asian-horror-movies/horror-reviews/shutter/