FILM REVIEW - Down's Revenge

Description:
David, an innocent mentally-challenged high school teenager,
gets bullied by three of his classmates, making his life miserable.
David's friend, Kim tries her best to protect David as much as she
can. After David goes missing, Kim becomes a detective to find
out what happened. As Kim's investigation continues, she finds
the bullies are being mysterously murdered. Her pursuit to find
the killer intensifies, she discovers one unimaginable link after
another.