A person assuming an obligation may set up a defense against the obligee which the former obligor could have set up.
Civil Act — Article 458 (Ground for defense of former obligor)
민법 제458조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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