Responses
--SPOILER BELOW--
-Spoilers for chapters 158-159 of the novel-
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So it IS an amnesia plot, but not for long. It's only a few chapters in the novel. And it's not complete amnesia-- just back to before the start of the plot. Back before their relationship changed and when Yoohyun was still avoiding + acting cruel towards Yoojin. To be more specific, I believe the recent memories of those who enter the fog are blurred. But considering what is coming, these next few chapters will definitely end on angsty cliffhangers.
If this is brother amnesia plot or something similar I'm gonna need to marinate this cuz BOY I am not handling angst on a cliffhanger.