I might be wrong but is a kdrama based off this?

I just read the summary, and I feel like it is. Are you talking about To the Beautiful You?

I think so....

I saw the kdrama long ago and I've re-read this manga many times but they feel soooo different!! I love the manga way better >.<

Yes ive google it and says here:
To the Beautiful You is one of the dramas that I'm interested to watch because it's the Korean version of Hana Kimi. ... This Korean drama has drawn so much attention to me because it's SM produced and its lead actors, Minho and Sulli are from SM.

And also hana-kimi is the short way to call it