From what I know (very little) of the situation, the prime minister is beyond simply corrupt, he is a true dirty devil. Now he's out of the country the army is acting. The reason the PM has support is due to bribes he hands out before every vote...
The King is the man from what i understand. He is cleaner than daz white. However, his son is the opposite and most corrupt. So, whilst this may get sorted out rather soon when the King pokes his head in and forces them to sort it out, it will only repeat on a worse scale when the King dies.
Good luck to the Thai people!