The debtor is bound to verify the regularity of the series of endorsements, and he has the right, but is not under any duty, to verify the genuineness of the signature or name and seal of the endorser, or the identity of the holder; provided, if, when the debtor effected payment, he was aware that the holder is not the person having the right or fails to know it owing to gross negligence, the payment shall be null and void.
Civil Act — Article 518 (Right and duty of debtor to verify)
민법 제518조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool:
https://mcp.apify.com?tools=kr-data/korea-law