[n120cky]

Well as non LN-reader here we go

Spoiler for A theory for eps 5 murder case:

I don't think Grimrock the the murderer, if I become Grimrock I won't use my creation weapon to kill someone which is just make me become a suspect on the case, instead use NPC selled or mob dropped weapon. So there is someone in the guild want to accuse him.

But I still don't know who, as not all guild member has been revealed.