It's also hands down Nirvana in Fire for me, but if you need more romance that I will say Rise of the the Phoenixes (romance is prominent there IMO but there is still a lot beside it). Unfortunately all my other favorites don't really focus on romantic storylines or hardly have any.
But as for romantic dramas I somehow keep coming back to Bloody Romance (the most touching albeit underplayed romance for me) and to The King Loves ( sweet, heartfelt and rather light) although I would probably not ranked them that high overall.