As far as it concerns the details and the Korean stuff that you mentioned that may be lost to translation i literally don't know what i am missing :P Thankfully i watch every film or show with English sub and not in my native language so i wanna believe at least to english the translation is decent. In my native language the subtitles are like a joke between me and my friends. He all gather and watch a random episode of a random show or movie (an English one in order to understand the dialog) and laugh our asses off. Worst subtitles ever :P

Now to the movie i don't know the actor nor the director so i am taking your word 100% for it. I am hoping for the second season to be better although i believe that it would be a greater idea for 12 episodes in season 1 and then a season 2 or the end if it's short. I say that cause till the time the second season will be up which i speculate at least 6 months, the hype will be lost. Also, i extremely like the fact that this is based on webcomic and it's an original coming from Korea!