Went significantly downhill after ep 10. I'm in ep 14 right now, at this point it's not even mysterious, it's plainly annoying. They're trying so hard to make this a suspense drama, this should've ended within 6 eps at most.

Unnecessarily dragging, way too many characters' perspectives shown, sad melodramatic music to make things emphatic, immature adults with unrealistic dialogues, also, nothing makes sense. To this point, the telepathy between the FL and ML does not make sense at all. The more it unfolds, the more unclear and annoying it gets. I'm not even curious about how this drama ends.
Why is there no evidence at all for all the murders but so many characters involved, and shown? Also, why are they all so stupid and immature?

There is no proper investigation from the police department at all, the worst group of police I've seen in a drama so far.