Someone Behind You (2007)

Ga In, a smart, pretty girl who is loved by everyone, witnesses the deaths of people around her. She is then singled out as the next in line to die from the curse that has one person in each generation die at the hands of two people close to them. Ga In searched for the truth about the curse with Suk Min, a boy who always lingers around her, and her boyfriend Heon Joong, but attacks on her life by those dearest to her, like her best friend and her mother, never cease.