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try looking through this tag:
https://www.mangago.me/tag/bodyguard/?page=1
OMG!!! Thank you!!! I found it. YEsh!! it was "Royal Seventeen". THANK YOU!
Its been more than 10 years since i've read it. Its about a highschool girl and her (mean) bodyguard. The author draws the male leads with jewelry, like rings on fingers. And in general, the leads had jewelry most of the time even in other stories