Mysterious Bullying

Mysterious Bullying is 2016 American psychological thriller film.

Summary
A 17 years old sister help her 21 years old sister to stop the bullying before it could ruin her life, she was cyberbully because of her affair of her father's boss. When she was murder on her young sister's 18 years old birthday and found bleeding in her bedroom. she has to undergrover her sister's secret and her killer but end up make herself as a victim.