Korean does use spaces actually, and Japan uses them sometimes but not consistently. Chinese is the only language I can think of that never uses them.
Arabic, Cyrillic Languages, Romance Languages, Ancient Hebrew, Sanskrit, Irish & Germanic languages all use spaces. Some of the Germanic ones just decided to get weird with it sometimes.
Chinese, Japanese, and Korean don't.
Korean does use spaces actually, and Japan uses them sometimes but not consistently. Chinese is the only language I can think of that never uses them.
Arabic, Cyrillic Languages, Romance Languages, Ancient Hebrew, Sanskrit, Irish & Germanic languages all use spaces. Some of the Germanic ones just decided to get weird with it sometimes.