I just watched Hot young blood and I really liked it so do you know a similar movie or a drama. Thank you in advance!

Maybe Sunny? It's a youth movie but there's no romance! Still good ;) & Shut Up Flower Boyband is a drama and it's really great if you like music & friendship themes xD Enjoy then!
Well movies having romance/school/youth/friendship...(or are you looking for ones with a gangster kinda female lead??)

Friendship
Kimi ni Todoke
Orange
She's on Duty