Responses

Spoilers
If the manhwa stick close to the novel, yes they'll lose memories. YooHyun, noah, sungjae sung, etc. yoohyun's memories will regress to when he had a fallout with yoojin bcoz he wanted to protect yoojin.
So what did yoojin do? He talked to seokwon (mkc guild leader) to use him to leverage with jelly, tricked him, and entered a dungeon so the 'ball' can help him get rid of seokwon. Then he got 'marbles' of memories of those who got involved in the fog. Yoohyun rescued/helped him get out of the dungeon and then they all went back home.
Did he lose his memories???