Uncontrollable gravity

My ex-girlfriend, with whom I had a precipitous breakup five years ago, is causing a scene at my blind date? The docile and obedient girl I remember now sports striking pink hair, a cigarette between her fingers, and an aura of mystery and danger. She arrives with a burning desire for revenge and to subdue him, only to find that the once-respectable "Teacher Zhang" has long since lost his youthful edge. But why is this seemingly inevitable confrontation spiraling out of control?