 If you liked
H20
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 ...then you might like
You're So Cool
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I think these two manhwas are pretty similar: they have the school's weird and good girl getting involved in a relationship with the school's very cool looking bad guy plus an awesome art. So if you liked You're so Cool you'll sure enjoy H20 too.
The artwork and feeling in both are really similar, Nan-woo (you're so cool) and Myunga (H2O) are similar not in personality but looks, and their relationships with Seung-Ha and Taek are also very alike. Both series are both defenitly worth checking out!