My favourite drama is I Hear your Voice, the main characters are a lawyer and a boy who can hear the thoughts of people around him.
My Girlfriend is a Gumiho is nice too, though it's not my favourite drama I've liked it a lot, same for Master's Sun. These two made me fangirlising a lot.
I'm currently watching Cheo Yong (1 & 2), but it's not a romcom, it's more a detective drama but it's quite nice, maybe you'd like it. Maybe you'd like Vampire Prosecutor (1 & 2) too? Give it a try ;)