Sorry wrong bl
At first I thought you were talking about this Salvation LOL.
https://www.mangago.zone/read-manga/salvation/
I Also thought that You were talking about The King's Maker.
https://www.mangago.zone/read-manga/king_s_maker/
Sorry, All I saw was blonde and "Confinement," Although, I don't know if I'm correct.
Yessss !!! That one ! Thanks :D
Oh! Yw :)
There is a blond king that summoned a black haired ML. He keeps him from leaving cause there is a plague outside that kills randomly. The king even has a son that he does not care about (brown hair, he had his mother killed cause he didn't want an heir or something)
At one point the ML escapes and becomes a teacher in some random village and then gets captured again. I think the plague had something to do with the church?