The reason is that they all generally have that refined Korean celebrity look and because of this we assume that they are. Etsy uses cookies and similar technologies to give you a better experience. Perhaps we find it weird.
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There have even been a few terms coined to describe the perfect look including glass skin chok chok skin and honey. Thats why they wear masks when they did not wear makeups or are not ready to be photographed. Perhaps we find it weird. Asian pop or any genre of music for that matter always comes with its own specific fashion quirks but this one definitely seems to be one of the weirdest Ive ever seen.