An illustration of the ondol system in english.
<a href="//commons.wikimedia.org/w/index.php?title=User:Dzihi&amp;action=edit&amp;redlink=1" class="new" title="User:Dzihi (page does not exist)">Dzihi</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span> (<span lang="en" dir="ltr">Original text: <i><bdi lang="">own work based on other pictures of ondol system</bdi></i></span>)