It is the same plot. This Korean version is the best out the three shows (Korean, Taiwanese, and Japanese). By best I mean-- it's a "romantic" "comedy" and if you have not watched any version-- the Korean one is the funniest one. The Taiwanese one is sweet too because of Jiro Wang. The Japanese version is too abbreviated, not allowing enough time for all funny moments.
written by the same writer and director, the same main actor (lee jongsuk), ost by Every Single Day in both the dramas, gives of incredible lessons through out the series. if you loved IHYV you will definitely like this one.