
What if there is no copycat killer and Cicero has been the killer all along, that's why the person wrote "I'm back" for the new murder. Maybe the promise was that Cicero wouldn't kill Jonathan so long as Kister took the fall, but since Cicero broke his promise and started killing again, Kister broke out of jail knowing the next victim would be Jonathan. So Cicero broke his promise first by killing again and Lister broke his promise by breaking out if jail.

Yes its true there is no such thing as copy cat killer and that message was from the real killer "cicero" and kister deciding to take the blame for everything which I think in return to protect jonothan and after the "copy cat killers" first murder I think the deal was brocken so Kister decided it was time to leave.

I'm honestly torn on if I like the original story more than the webcomic. It's been so long since I read the story(way back when the writing was debating on making a comic version). I can't fully remember, but I believe a few scenes changed, some for the better, but a few I miss. I feel like the comic is progressing much faster which makes sense when you have to wait a week for 1-2 pages to release . I actually kind of like the faster progression at times like this confession.
I'd honestly pay for this in a heartbeat if it was translated in English. This story is so good.