Not really a spoiler, it’s just my opinion

Is there any chance that Zodiac actually a NPC in the game?
I mean, he was working as a doctor when suddenly it becomes a dungeon? Why only there? MC world never turn to dungeon, be it in the past or now.

I think, Zodiac is a NPC that realized his world was a game and couldn’t accept the death of his brother and comrades for a “mere game setting”.
That’s why he turned to be a serial killer that treat others like cannon-fodder just like the game treat him and his people.
That’s why he seems to know all the secret in the game because he keeps looping into the start of the game (the hospital becoming dungeon) and keeps trying to do different thing and, yes, become twisted..
And also that’s why, he confronted the MC because suddenly there is another player that know and beat him to some “things.” And realized MC is different and becomes something like “a clue” or “a helps” that could actually help him escape the loop.


Or I’m just tripping…