A mad premise and an entertaining movie!
So, an underage girl tricks a player into sleeping with her...she videos it to blackmail him...into taking her to her school prom....and of course, they fall in love.
You'd probably be jailed and at least excluded from polite society for even suggesting such a premise in Hollywood...but this works and is a genuinely good movie with more than one real laugh out loud moment (some pretty close to the bone!).
I'd describe it as a dark humor romcom with a real 80s highschool movie feel.
Viet cinema puts out some gems...just leave your western sensibilities at the door.