How to meet a perfect neighbor (2007): he’s not the main lead but in the end he gets the main girl.
Prosecutor Princess (2010): in the beginning he seems the second lead, but hey, no way, he’s the damn protagonist and in the end he gets the girl
Queen of reversals (2010): in the same year he gets the main girl once again. and guess what? he was the second lead.
The Princess’ man (2011): he’s the man of the title.
Cheongdamdong Alice (2012): …I leave the rest to this picture: