Many things in Korea are technologically advanced to American technology because it is a smaller country and they are able to apply these advances (did you ever notice Korea's internet is literally 50-100x faster than the fastest domestic fiber optic connections in the America?). Like even the light switches are automatic as you might have seen in the movie they have motion sensors. The pen holder is just an advanced version of the classic pencil cases we have here that have manual expansion/retraction abilities. The one in the movie is just automatic and pretty much useless in my opinion. It's just for convenience in offices so that there is a flat surface to work on when necessary instead of protruding objects getting in the way (like the pen holders glued on top of the table that you cannot movie).
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