I want to quit my job and work for BYD. The leader refused to approve the resignation. What should I do?

Resignation is the right given to workers by the labor contract law. As long as the employer is notified 30 days in advance (the probation period is 3 days in advance), you can leave your job after 30 days. There is nothing to worry about.

But be careful: you should keep the evidence that your employer received your written notice of resignation. You can express it to the employer, and the notes on the face sheet will indicate someone's "resignation notice", and you will leave 30 days after the other party receives it.