An offer of a contract which does not specify a period for acceptance loses its effect if the offeror does not receive a notice of acceptance within a reasonable period.
Civil Act — Article 529 (Offer of contract not specifying period for acceptance)
민법 제529조
For AI agents and developers — get this article as JSON, with the English and current Korean effective dates and an outdated-translation flag, from the korea-law API or as an MCP tool: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