In the absence of any declaration of intention to the contrary, ratification shall be effective retroactively as from the time the contract was entered; provided, the right of a third person shall not be prejudiced thereby.
Civil Act — Article 133 (Effect of ratification)
민법 제133조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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