Can't remember title or author for the life of me, but the plot was like the MC tried to summon a demon only the demon he thought he summoned was actually an ex-convict, who then turned out to be an actual demon. Ring any bells?
https://www.mangago.me/read-manga/my_bad_painkiller/
That's the one, thanks! I really like it's both dark and wholesome :)
Can't remember title or author for the life of me, but the plot was like the MC tried to summon a demon only the demon he thought he summoned was actually an ex-convict, who then turned out to be an actual demon. Ring any bells?