 If you liked
Ousama★★Game
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 ...then you might like
Royal Fiancé
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Both are different in many aspects, but what they do have in common are the following:
1) They're revolved around royalty
2) One of the main characters are consider cruel to their 'lover' towards the beginning.
3) They fall in love with each other- the other finds contentment being that he is now finally useful for the other character.