Beyond Our Ken (2004)

Beyond Our Ken 2004 / 公主復仇記 2004 / Gung Ju Fuk Sau Gei

Shirley, a karaoke waitress, leads a perfectly normal love life with her fireman boyfriend - Ken. One day she is confronted by Chan Wai Ching, Ching is Ken's ex-girlfriend. She tells Shirley that Ken is a bad guy. She tells her when they were a couple, Ken took nude photographs of her. Soon after taking the pictures, he dumps her and posts the photograph's over the internet. This soon gets out of control when it turns out that those photos caused Ching to lose her job as a teacher. Ching no longer cares about Ken, but she wants those photos back. She convinces Shirley to help her sneak into Ken's apartment and destroy these photos, which are stored on his computer. Shirley agrees to help as she feels she might be led down the path. Together they plot against Ken, and it only looks like they've skimmed the surface. (Source: AsianWiki)