Oh I always wondered why the artstyle kinda change at the end of the season, it's to show ...

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Is he going to get sick or smth

Yugun is sickly, they mentioned how he joined the class later than the rest because he fell terribly ill. He has allergies, diabetes I think(?, and has frail bones.

And other illnesses I don't remember, he listed them in a chapter.

I just read the raws and I'm not really updated with the current chaps, but I think his appearance is hinting smth ╥﹏╥