Responses
Biron is not the copycat theory 1 correct but i think tht friend with black hair i forgot his name but the stalker could be the serial killer he is too obsessive and he once thought tht the ML was slipping through his fingers the friend bf base on the last episode he could b a cop maybe
1st theory : I don't think the copycat killer is Baron (the red hair dude). I feel like he is only trying to protect his brother whose name he accidently found in the notebook?! He was scared that Jonathan would be murdered and that's why he was so into investigating Kister.
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2nd theory: Kister is obviously not innocent but is still somehow innocent?! We have seen a little flashback and looks like he was forced into this. And whoever has forced him in this was the one who wrote names if people to be killed. And the copycat has seen the notebook? Maybe.
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There are so many plot holes in my theories lmao idk I am not creative