 If you liked
Kiss Me Princess
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 ...then you might like
Totally Captivated
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Both of these have pretty artwork and are Manhwa. Totally Captivated is also shonen ai, although a bit more explicit (16+) But if you like Boy Princess, which has a good amount of comedy to balance drama, Totally Captivated would also be a great book to read. The storylines are entirely different, but the tone is relatively similar.