Does it have to be Korean. If it I can recommend these:
nodame cantabile, five fingers, Beethoven's virus, what's up, dream high, persevere goo hae ra, ultimate kpop survival, battle of Changsha, perfect couple, empress ki, sungakuen scandel, cruel city, bad guys.
If you love you're beautiful, check out fabulous boys .. Its the t-version and also just as good