 If you liked
King's Maker
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 ...then you might like
Isekai no Sata wa Shachiku Shidai
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It is rare to find BL manga that not only happen in an alternate world but also focus more on world-building and its characters than the romance in the series. The evil king/prime minister also has his sights set on the uke, but ofc, the seme (who holds an important position in the palace) eventually rescues his beloved from the clutches of the evil overlord.