The acquisition, loss of, or any alteration in, a real right by a juristic act over an immovable takes effect upon its registration.
Civil Act — Article 186 (Effect of changes in real rights over immovables)
민법 제186조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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