Do I need to pay social security and medical insurance?

Yes, social security includes medical insurance. If you want to buy social security, then medical insurance will definitely buy it. Usually social security and medical insurance are paid together, and the employer will deduct this part of the cost from the employee's salary. And social security and medical insurance are complementary. Social security mainly guarantees pension, unemployment, work injury and maternity, while medical insurance mainly guarantees medical care. If you only pay social security and not medical insurance, you will not be able to get corresponding protection when medical expenses occur. So both social security and medical insurance should be paid.