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Idkkk maybe he is just aroused by the idea that people could watch but still don't want it to happen ?! I was sure it would not happen, Hwayoung would not show Gyuwon to other people... or maybe they will one day, there is still a lot to come but I didn't read the books so I don't know for now

Spoil chapter 109 (for worried people who need it)
It's in chapter 109 that it's revealed that they couldn't actually be seen by the people (the wall in glass is totally black to them), you all will have to wait for the revelation