I agree with you 100%
YESS I think that it's even more explicit when Inseop brings her closer and both don't show any kind of warmth and no sexual tension towards each other. Honestly, I think Inseop is trying to see if HE is attracted to her in that way too, not only as an obsession. In earlier chapters when she asks him if he liked her he didn't have an answer and even reflected on it. But now he sees that's not the case. he is also upset with her about it. Like, "she doesn't see me that way, so it's harder to manipulate her"
at least that's how I'm interpreting this.
ALSO he is clearly upset of how things turned out, he got what he wanted (her being in his house) but she is not there willingly, she knows everything and isn't quiet about it
Inseop most likely has antisocial disorder, he probably cannot even produce what we call love. What he feels for her is different from what he feels for his objects he said it himself that it was the first time he felt like that, but this is the closest his mind can achieve to produce such feeling. Also Inseop ace asf.
ATE ATEEE, EXACTLY
Honestly I don't think there's romantic attraction between them. Inseop is obsessed with her, but in the way that he wants to make her his possession I'd say. And by possession, I think he wants to make her succumb to believing that she belongs to him, starting by crushing the belief that she can get the upper hand in anything. It's quite clear what he's doing, and I saw ppl saying that she shouldn't be shaken, but I think it's necessary to rmb that mc is actually a normal human trying to go against a freaking psychopathic killer. And she has already suffered from him plenty, she is constantly stressing out, walking on eggshell, and she has to try and interpret every single actions he does.
For some reasons, I think she won't kill him, maybe she will inflict a kind of mental torments that torture him forever, that seems like a way better end for him, befitting a manipulator toying with ppl's minds