beta
Just an opinion but the white-haired obsessive dude (can't remember their name) and the senior (also can't remember) with brown hair which is like a second hand of the white-haired have a lot of potential to become a BL story but a kinda toxic type to fluff like that(づ￣ ³￣)づ
So I've read the chapter 19 and I'm speculating that her murderer is her brother
In ch. 19, it was revealed that he was totally downbad towards her, catching a knife in her stead and being totally indifferent from it and is instead blushing when the Fl showed concerns towards him.
In addition, the ch.19 also showed a twisted belief about unrequited love where you kill someone you love and commit suicide after, then you would be able to take their soul with you to hell.
Therefore, I'm thinking what if, her brother in the original was twistedly infatuated to her and since the OG her hated the brother, which eventually leads him to killing her to be able to "be with her" in hell.
(〜￣△￣)〜