The movie was certainly nothing like the cover. There was nothing supernatural about it unless you count the last few minutes when he was running away from the police and was running up in the air. He couldn't follow through on that because he had just given blood to a suicidal student. Obviously, he loved his students more than he cared for strangers who wanted to die.
The movie was slow to the point of tedium.
The nerdy biology teacher was living a double life as a part-time vampire. The teacher reminded me of Johnny Depp in The Secret Window--with his long hair, glasses, dimples, and short stature. He was even taking care of his mother who had dementia but warned him at the end about the police.You could kind of tell it was not written as an American product.
There was no real horror in killing somebody gently if they wanted to be killed because they couldn't seem to carry out a suicide on their own. He was more a modern-day Dr. Korvorkian or a gentle serial killer. The writer left much too much to the imagination like how he became a vampire.
There was a scene where the gentle nerd watched a would-be "vampire" rape a girl while smothering her with a plastic bag. Our "vampire" only got indignant, he didn't try to stop it.
If he was a vampire, he was too timid to try to fight or handle conflict in his quest for blood. He even got sick on blood from the victim at the beginning of the movie. I would guess that was because the blood was cold. There was one tender scene near the end where he could not take the blood from another suicidal girl who he took the time to get to know in their walk out of the woods. She promised to give him blood willingly if he would stop killing the suicidal. So, a relationship was starting there, but was interrupted by the police. I would suspect that no faithful vampire fan would buy it or want to own it.