the scene in ch.2 is all we have to go on rn, which is presumably what happened the night of the attack that got ml injured and the bf killed. contextually, it makes sense to be that incident. ofc, it could be a red herring and entirely unrelated, but we won't know until the author shows us what happened in full. i wrote that comment on the assumption that he did and what other comments are saying, if that makes sense.
but no, there's no confirmation yet that he killed the bf.

i know there's only 3 chapters here so far, but i need to talk about this somewhere lol
anyway, i know it's pointing to killing the bf bc he likes the mc, but having read up to chapter 6 on the officials, i think the bf had debts or got caught up in whatever business the ml is also caught up in (chapter 4). like, sure he's acting like a right stalker and clearly something's up, but i feel like it's a red herring, you know? like he's clearly involved but idk if he killed the bf bc of mc or if that was like, a bonus? did he even know it was his bf, really?
ml is still a massive red flag, if not a black flag atp. i'm curious to see where the story goes but i think it's safe to say a happy ending as we usually know it is not guaranteed or even wanted, depending on how this pans out.