You believe that it's OK to underpay workers because they are not forced to work at a school. The only alternative to this if full fledged slavery. The economy and lack of job opportunities forces young teachers to accept unfair salaries, and unscrupulous employers take advantage of this in defiance of Chinese labor laws.

While the Chinese teachers may have 2 full days off per week, this is at a school where almost all classes are only taught on weekends.

"Boss racist? Nearly half of the foreign staff this term is black so if the boss is racist it isn't reflected in school policy."
The evidence that he's a racist is that he's underpaid black employees on the grounds that they weren't white. If they are not lying than he's undercut their salary because of a racial bias.

"For a prospective foreign teacher, though, this is a good place to work as the workload is light and concentrated on weekends." The workload sounds light as compared to a 40 hours work week in the West. However, even if you only teach 20 hours crammed on a weekend, you still should do adequate preparation, which could tag on another 6 hours that you're not paid for. Teachers in public schools teach less hours and get a much better salary and benefits package.

"I understand the need to turn a profit (it is s business, after all) but this school, compared to other Astons, cries for a major facilities upgrade."

Of course all businesses need to make a profit. That goes without saying. But that doesn't justify unnecessary exploitation of workers out of pure, ruthless greed.

"The school will try to give you as little as possible and you'll try to get as much as possible--come to an agreement and get it written in your contract!!!" This just justifies selfish stupidity on both ends. A teacher that does as little as possible and tries to get as much as possible, and a school that gives at little as possible while trying to get as much as possible from teachers deserve each other. Imagine a school that gives teachers what they deserve and where teachers earn what they get.

Hanzhong Aston remains a myopic business, so focused on short-term profits that they undercut their long-term gains by continually sacrificing their teaching staff out of ruthless opportunistic exploitation. Somebody needs to update their business model, and also realize they are in a service industry where the teachers ARE the product. Doy!