My Princess, Smile You, Pasta, Secret Garden, Your Beautiful, My Girlfriend is a Gumiho, City Hall, Last Scandal, Coffee Prince, Hana Kimi (Original), Protect the Boss.
Considering listed genres; my most favourite romantic comedy are Reply 1997 & Personal Taste. After that Secret Garden.
But considering dramas that are not regular romantic comedies. Serious but funnier than rom-coms....Alone in Love is my #1 and Lovers is #2.