Looking for an action webtoon

I’m searching for a certain webtoon that I read before, so if anyone could help me find the title plsss! So I remember: the ml was disabled with blindness and got bullied in school up until high school. (He got that disability because some bad guy burned his home and killed his family). He gets help from this friendly grandpa, that’s basically his family now. Later on it reveals that He helped the ml because he felt guilty that he didn’t save them. Aside from that, there was always this black creature/soul thing helping the ml out. (The thing turns out to be his dead brother that took that form). One day the ml was getting beat up really bad, he takes the creature’s deal, of being cured. So he gets cured and gets stronger I believe? And then this whole evil ceo or something that created this organization, where they turn humans into dark souls. And the ml is capable of taking in hundreds of the dark souls. There’s more but omg I’m frustrated that I didn’t save the title!!