Hello, I'm looking for a manga where the main character is part of a secret organization and has to either live a normal life to keep his secret or live inside the organization. He could have special powers or be a military type, or both. Or just a normal guy that found out too much and now hew used as a sacrificial pawn, or the organization took him in cause they discovered he has some kind of powers. Idk what i want either, it just has to do with a secret organization, so the requirements are vague but as long as there's some sort of resemblance to what I'm looking for please do suggest them.
Thank you

Oh, I think these hit the mark but I've already read them:
Deathopia
Code Geass
The one with the blind guy with a katana, can't remember the name and I can't check my list of manga I've read right now.
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full metal panic