Responses
https://www.mangago.me/read-manga/necromancer_survival/
Go to the novel it's much better and also its complete!
Sound a bit like - A Trace of the Wonder (Yaoi)
Searching for this bl manhwa, mc has orange hair and the skill of bringing back the dead as his servants, I think it was. One of them is black haired ml, he used to be the leader of one of the strongest teams, but was betrayed by one of his companions, it's a revenge story. Sadly I think it was dropped, haven't heard from it for ages now... thanks!