This study considers the type of `Majgineun Mwoga Maj a!(What is correct!)` as an example of expression frequently used by Korean people. In the results, the relevant expression was used under a certain precondition, which could be generalized in the form like below. XNpredicate1 Ypredicate2 XPending3 ◎XN：nominal from verbs·nominal from adjectives·noun·pronoun ／predicate1： eun· neun· yo ◎Y ：pronoun·adverb·attribute ／predicate2： i· ga· eul·Ø ◎XP：verb predicate·adjective predicate·noun predicate·pronoun predicate ／ending3： a· eo· yeo· ya·Ø·etc. Also, suggesting the translation of the relevant expression in Japanese, there were more natural responses considering the context rather than literal translation, which is an important point in the aspect of natural learning of Japanese. The significance of this study is to provide useful data to Korean learners of Japanese, Japanese learners of Korean, and researchers of foreign language education.