Sorry to frighten you! If you can find a new job before they process your work visa I would definitely jump ship. There are so many school in Shenzhen offering comparable benefits without many of the downsides of Yaohua. If you choose to stay at Shenzhen Yaohua, then keep your head down, and don't engage in conversation with Josh Garduno, Jenny, or Crystal. Just doing that should make your life better.

Good luck!