Responses
Well, NK was feverish before and also (I know SH plastered himself to NK) maybe it was done to make NK feel like there was a barrier or less intimacy between them.
Blanket wouldn't do much at the end of the day if SH decided to break his promise but blankets are used as a flimsy barrier a lot in romantic tropes (usually Shoujo)
Spoilers
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Can we talk about how Seungho gave Nakyum all the cover/blanket and didn't cover himself even though he was wearing thin white clothes? That cuddly scene took all my UWU baby Nakyum is so cute (╯°Д °)╯╧╧