No real right can be created at will other than ones provided for by law or customary law.
Civil Act — Article 185 (Kinds of real rights)
민법 제185조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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