I Became a Leader in a Wretched Prison - Vol. 1 Ch. 2

[MangaDex]

 

[halcer]

I feel like I've seen this before

 

[LtClone24]

I feel like I've seen this before

If its for the concept I can't help you on that. But this was released a while ago as a demo chapter. So that might be what youre remembering.