Study at language school and work?

In which developed country you can study at language school and work at the same time. I heard that in Korea you only can work after 6 months. Can you start working illegally or will be arrested? Which country u think is best for it? Cause without it I don’t think I can afford it with money I earned in my country. Where is the best option, In America, Europe or Asia?
Study at language school and work?
Post Opinion