If you are new to Kdrama then I highly recommend: My Love from Another Star, Secret Garden, goblin. Those are highly addicting dramas. And quite good.
if you want light coming of age dramas with the bad boy-clumsy girl plot, then try Monstar and Reply 1997.
But for Chinese drama I recommend is Love O2O and boss and me. Also try taiwanese dramas Meteor Garden and Fated to Love You
for Japanese drama, if you want that Bad Boy clumsy girt dichotomy then try: the Black devil and the white Angel... and then Good Morning Call.