This was on the door at work today.
Referring to the “whitish” the bit in the middle, reading from top to bottom, it reads as “bang bang cock cock”, or perhaps more accurately as “bung bung cock cock” (when Koreans write Korean words in English, “a” always has an “uh” sound). The question is, what the devil does it really mean?
Incidentally, the large blue word on the top right, coupled with the yellow letters, would read as “moon ho”.
My better half has just informed me that “bang bang gock gock” means “every place and corner of the country”. So there you go. Class dismissed.