Law, notices and technical guidance
Legislation and technical guidance serve different functions. For a notice, check its authority, scope and text rather than relying on the title.
Laws & guidance
MOEL Ordinance No. 448: heat exposure, rest and daily records (Partial amendment to the Rules on Occupational Safety and Health Standards)
Korea defined prolonged work at a workplace apparent temperature of at least 31°C as heatwave work and specified periodic rest at 33°C and above.