So-Man was raised in a highly traditionalist family who strongly believes women's place is the kitchen, so she doesn't need to go to school or learn anything other than domestic chores and pampering herself.
So-Man did go to school but is naturally not very bright so she rapidly dropped out to become a beautician or a manicurist.
So-Man is smarter than anyone on the show and doesn't take kindly to being associated with the stereotype.
Lampshaded: "So-Man, honey, you should really just stay here and smile. That's what you do best."
Invoked:"We don't need So-Man to be intelligent. She's just here to be Ms. Fanservice so..."
Defied: "Don't speak funny to me! Just because I'm an Asian girl doesn't mean I'm stupid!"
Discussed: "Yeah So-Man's hot. That's pretty much all there is to say about her."
Conversed: "Why must Asian girls be so stupid on TV?"
Deconstructed: So-Man believes that her beauty is all she needs and usually doesn't give much thought to anything else. She meets Bob, a pimp, who has long understood how profitable beautiful stupid women are. He easily seduces her and she ends up selling her charms to survive and avoid getting beaten up by Bob.
Played For Drama: So-Man is mentally retarded but, since people already expect her to be stupid, nobody spots her mental retardation until late in the story.