I taught in China for a brief time years ago and used to have people come and ask me if I would give private lessons. I wasn’t interested at that time, but if I go back I might want to supplement my income this way. Is teaching private lessons (while employed on a Z-visa) illegal, or is it a gray area? If it is, have there been any crackdowns on teachers who offer them?
For clarification, I’m not asking about the contract, as I know that most teaching contracts forbid outside employment, but about the actual law of the country.