Manual of Labor Handling of Social Security Center

Before you apply for social security, you should apply for employment registration with your labor handbook. After the employment registration is completed, social security transfer or new employment can be handled.

Under normal circumstances, the company will keep your labor manual until you resign (resign), and the company will help you to register your resignation and then return it to you.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.