 If you liked
Why Raeliana Ended Up at the Duke's Mansion
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 ...then you might like
Adelaide
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Both full-color manhwas have a similar premise, plot and atmosphere in general. While both are comedies and simply hilarious, Adelaide is at times a bit more humorous and Raeliana has a few semi-dark moments (as one would expect when reading a work that touches upon murder and death, no matter if it's a comedy or not).
All in all, if you like one of these two, I'm sure you'll like the other title too.