@axo well it's basically 'hyung' so most of regular readers don't mind it bcz it can be used for older males by younger males.... Not strictly brothers... The relationship can be anything.... Well bcz there is no particular translation for that kind word that's why english translation often use brother...
action - https://mangabuddy.com/manga-list/143761
Hist rom - https://mangabuddy.com/manga-list/144070
Mod rom - https://mangabuddy.com/manga-list/145936
BL - https://mangabuddy.com/manga-list/155726