If no provisions applicable to certain civil affairs exist in Acts, customary law shall apply, and if no applicable customary law exists, sound reasoning shall apply.
Civil Act — Article 1 (Source of law)
민법 제1조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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