I might be biased as I’m Korean myself, but written Korean is probably the easiest of the East Asian languages to read if for no other reason than that you don’t have to memorize hundreds to a thousand+ Chinese characters as in Chinese or Japanese to become functionally literate.

Chinese characters (called Hanja) are still used here and there in Korea but they are very rare and you don’t need to know them at all to function. Versus Japan where knowing Kanji is pretty much necessary.