what do you mean?
You mean the part when *spoiler alert* the red hair guy Robenin accidentally slashed Undine and cut Jeanie's mouth to the point it bled? Although he looks more like an ML, but that part did make me dislike him a bit. It's clear Jeanie hates him too since he hurt Undine.
I think there is something with the red head’s sword as we can see it can nullify any kind of magic from magician or elementalist. Then undine was slashed using that sword i dont know if undine ceased to exist because of that and i think the reason why jjeanie vomits blood is because of undine’s connection toward her master (mana?) and it was forcibly cut by the sword. I dont know if undine still exist or was erased due to the sword. Just base on the picture. I didnt really translate it.
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I think the moment chapter 40(raws) happened the red head guy became the 2nd ML forever.