The option shall be effective retroactively from the time the obligation arose; provided, the right of a third person may not be prejudiced thereby.
Civil Act — Article 386 (Retroactive effect of option)
민법 제386조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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