Responses
I don't think it's stockholm syndrome, since they already feel attached to each other since they were young. While stockholm syndrome is the feeling that grows in the period of kidnapping. If not for his past attachment, I'm sure the victim wouldn't end up having feelings with the kidnapper, since he's characterized as a selfish person, he wouldn't easily have either sympathy or empathy toward the other.

Can I ask you guys if they end up with each other? Like at the very least, love actually happens and not only stockholm syndrome doing its thing? Or one of them dies or they just aren't cut for eachother because of mistaking stockholm syndrome or something.
I avoided Killing Stalking because I honestly hate the gore but it is good, just not my cup of tea. I just wonder how similar this is going to be with KS...