It appears that the contributions need to be continued even though the SSA-IN&KO is signed and official, as per the following FAQ extract from the EPFO India site. This needs to be clarified.
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Special Provision for International Workers - Frequently Asked Questions (FAQ)
18) What is the status of the SSAs?
As of today, Social Security Agreements have been signed with Belgium, France, and Germany. However, the date of entry into force is yet to be notified. Negotiations are at various stages with The Netherlands, Czech Republic, Hungary, Norway, Switzerland, Sweden, Luxembourg, USA, and Australia. Government-level talks are ongoing with many other countries where sizable numbers of Indian workers are employed. Although not a formal agreement, there is a reciprocal arrangement between India and Korea to settle the claims of the employees upon completion of employment in the host country.