I think this is Arandor.
Damn, I think I just realized something. Well, I messed up... Yesterday I figured out that Arko wasn't Watson and didn't believe him, and now I understand why I should have believed him... Turns out, subtle hints aren't for me.
Spir told me two days ago that Bin takes a player with him even during the execution, just like a rogue. Now that almost all the roles are known, but if he had been executed at the beginning, who knows how it would have ended.