National Pension Act Article 17

The insurance periods will not be calculated if the insured person fails to pay the insurance premium and interests payable within the deadline under Article 13 and Article 14. The insured person is not entitled to request to pay the insurance premium and interests if the delay is over 10 years. However, the insured person is still entitled to request to pay the insurance premium and interests and calculate his or her insurance periods if the cause of delay cannot be blamed on the insured person.