Who's That Knocking at My Door? (2007 Feature | 88 minutes)

A young loner named Je-Hwi was tormented by a classmate named Pyo in high school. Now a young adult, Je-Hwi begins to open up to his girlfriend Jang-Hee. However, a revenge plot he had hatched against Pyo with a stranger he met over the internet, begins to grow way out of control with cruel and unpredictable results.