5. Ondol heating system: The Ondol heating process, which requires heating stone slabs underneath the floor with fireplace, is a typical feature in regular Korean architecture like These uncovered on Jeju Island. Several buildings with the Folks Village also use this technique for heating for the duration of cold winters. https://hector3kv7a.blazingblog.com/31459693/getting-my-jeju-culture-to-work