With how these manhwas work it's unlikely they'd make it a gay love triangle for such big and key characters so imo this confirms Haru's gender or at least assigned sex at birth. I mean if they did that'd also be pretty cool in a "wow that's rare to see" kinda way.
I still find it disrespectful how our MC made Haru wear clothes they didn't want to just cause he liked how pretty Haru is.
haru is a guy, I have a sneaking suspicion that the guy doesn’t “like” like haru but care for him since they’re friends, then again I don’t know if Daniel calling haru “her” is a mistranslation