What should I do if I meet such a horrible boss?

This is the case in the design industry, but I advise you not to work in this company. There is no future for you to follow this boss. This boss is such a playboy that he is deducted 200 yuan a month. Maybe he wants you to cooperate with him steadily and earn bank interest. The boss of a design company I know will try to keep you until seven or eight o'clock in the evening even if nothing happens. The design company is not formal, but there are good bosses. Good luck!