
At the point where he got injured the first time like holy thats a lot of blood AND HE REFUSED FOR HIS WOUND TO GET CLEANED BY HAYAN... Wut u hiding boi? Super regenative powers?????? Hmmmmmm
THEN HE GOT INJURED AGAIN... he being super injury-ish-sush AND BLEEDING ALOT on his head TWICE but he was fine hmmmmmmmmmm sus ISTG THIS HOT CUTE BEAUTIFUL MAN IS ACTING A BIT SUS

i kinda skipped a bit of the novel- a lot actually to see the ending
.
.
.
.
.
Eugene and Hari are together in the end but it seems that no one really knows of their relationship, i know this one guy do and maybe a few others BUT Erich (youngest bro) doesnt know... idk if cabel does or naw

Everyone knew actually, even Erich. I think they announced their engagement or something, probably in the side story(?). Between the brothers, Cabel seems to be the hardest to accept their relationship, but slowly accepting after Eugene and Cabel had their bro talks. Erich accepted it quite easily because...
He also fell for her. Iirc Hari doesn't know, but Eugene sorta(?) knows about this.

https://wuxiaworld.site/novel/beware-of-the-brothers/side-story-2/
This is where i read it :)) Hope it helps

Wait im confused coz this is what i know
.
.
.
.
If Rezef is the empress and the duke's (raphael's father) son... Rezef and Raphael are half brother BUT Cayena is the Emperor's daughter but not from the empress... That makes her Rezef's half sister but no blood relation with Raphael right??

I'm pretty sure Rezef is the son of the King, and Cayena is the daughter of the King, but Rezef is an illegitimate child, so he isn't the son of the empress (whoever she may be), and we don't know if Cayena is a legitimate child or not, yet. Raphael has no relation to the crown, he's just from a rich family which owns a huge army who protects the kingdom. That's how I understood it.
Holy shit HAHAHHAHAH aight i mean this is better for my heart than the more fucked up ones