Boundary marks, fences, ditches, etc. set on the boundary line are presumed to be co-owned by adjoining neighbors. But this shall not apply if the boundary marks, fences, ditches, etc. are constructed at the expense of only one of the adjoining neighbors, or the fence forms part of a building.
Civil Act — Article 239 (Presumption of joint ownership of boundary marks)
민법 제239조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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