Do I have to leave after 4 years and 10 months? Can I come back in?

The principle is departure, but if you meet the requirements, you can return and continue working one month after departure (re-entry employment exception, only once). Requirements vary depending on the reason for changing workplaces and years of service. Before departure, the employer must re-enter the country and apply for an employment permit, and a labor contract lasting at least one year from the date of re-entry is required. There are exceptions where a short contract period for a current workplace is recognized. If you plan to change companies, before moving, inform them of your industry and change history and ask the employment center or 1350.