Kaikan Phrase (I'm not sure how to classify it, but there was romance invovled (more towards the end of the series though))
Ouran High School Host Club (mainly comedy with some romance)
복숭아 Girl (full of romance and drama)
Romeo x Juliet (so cute)
Special A (comedy + romance)
Vampire Knight and Vampire Knight: Guilty (had some romance)
Tsubasa: Reservoir Chronciles (comdey + romance + adventure. the 아니메 doesn't actually finish and is too long that is why i liked the 망가 better, but the 망가 gets complex towards the end as well)
try Zero no Tsukaima, Dragon Crisis, Toradora, Special A, The Girl Who Leapt through Time (it's actually an 아니메 movie, and there's also a live-action 2010 version that is TT^TT beautiful!) 앤젤 Beats Bungaku Shoujo
His and Her Circumstances [Kare Kano] (Definite romance) Maison Ikkoku (Definite romance) 사랑 Hina (Quirky fun comedy romance) Pretear (Quirky fun comedy romance) Ah! My Goddess (Quirky fun comedy romance)