T-Ara bullied one girl till she was gone, and being a flop since then.
Seungri (from BigBang) sex scandal when he choked a girl, lewd on her chest then throw her a towel.
BOM (from 2NE1) smuggling drugs.
Ladies Code car accident.
Seungri car accident.
TVXQ being beat down by SM, and half of the group leaving the company.
Glam having and obsessive fan in their lineup, and a girl who blackmailed an actor.
G Dragon, drug scandal.
Lee Hyori 10 plagiarized songs in one album.
EDIT: oh and Arheum, this bitch went mental in front of our eyes.
And so on...