In Korean, the particle has different form according to if a before letter has trailing consonant. (For example, 를 (reul) is used only after a word ending in a vowel. If the preceding word ends in a consonant, 을 (eul) is used instead. For further information, see https://en.wikipedia.org/wiki/Korean_postpositions) To solve this problem, we need to install Josa extension (extension by @devunt).
Currently, we are using Lua script (Module:Hangul) in Korean Wikipedia now, but lua script is too complex and heavy. (and also user-unfriendly and wiki-specific).
So I request to install parser function extension Josa for all Korean wiki farms (including kowiki, kowikinews, kowikibooks, kowikiquote, kowikisource, kowikiversity, kowiktionary).
Extension Link: https://www.mediawiki.org/wiki/Extension:Josa
Local community consensus: https://ko.wikipedia.org/wiki/%EC%9C%84%ED%82%A4%EB%B0%B1%EA%B3%BC:%EC%82%AC%EB%9E%91%EB%B0%A9_(%EA%B8%B0%EC%88%A0)/2014%EB%85%84_6%EC%9B%94#.EC.A1.B0.EC.82.AC_.ED.99.95.EC.9E.A5.EA.B8.B0.EB.8A.A5_.EB.8F.84.EC.9E.85