This drama is a mess but it's an entertaining mess.

Story
Overall, the story is good.
Who is Kara and why is she obsessed with Yuki?
It's explained in a few plot twists at the end. I predicted them and I think anyone who watches a lot of crime dramas can see what they are.
The ending is wacky. I'm not disappointed but it could have been better.

This drama has a great (not love) triangle , Kara is obsessed with Yuki, Satomi is obsessed with Kara and wants to prove she is involved in a crime and Yuki thinks Satomi is cheating on her with Kara.

Yuki was annoying and kinda dumb, she gets better later but her character wasn't really fleshed out. She is Kara's obsession and Satomi's girlfriend, other than that there's not much importance.
She trusts Kara who she met a few days ago over Satomi who she knows for years.
She goes to the villa in the woods with Kara and doesn't tell anyone.
She is okay, meh character.

Side characters are also dumb and annoying. Sometimes so dumb I want to slap the screen. They don't investigate anything properly and they are fast to point fingers at Satomi.

Satomi is cool. He is smart and he does everything to protect Yuki.
He was the one who realized Kara was fishy and started to investigate her.

Kara is cool and smart. She is also crazy. She keeps murdering people but nobody seems to notice (except Satomi).
She is always close when a murder happens but the police can't connect the dots.

What made this drama awesome were Satomi and Kara. He keeps chasing her, she keeps running away.
It was fun watching them. Their dynamic and conversations were what made me watch this drama to the end.
For them this drama gets 10/10.
For the rest 7/10.

Would I recommend this drama?
I don't know.
It's a bit frustrating in the beginning, ep 1-5, it gets good and crazy from ep 6 and then ep 9 is completely insane (insane in a way leave the logic out of the door).