Having looked at your 'watched list', there are a couple that you haven't seen that I thought might be to your liking, namely
Soul-mate - quite unusual and off beat for a Korean drama, underrated
Sungkyunkwan Scandal - despite romance only really happening to one couple the bromance is hilarious
Hyena - another totally underrated drama in my opinion with quite a few couples and lots of laugh out loud moments
Plus nine boys - about 3 brothers and their love life's
Coffee Prince - lots of different love stories of a group of men working together in a coffee shop
Dal Ja's Spring - again involving the relationship of a number of couples besides that of the heroine's
Discovery of Romance - despite it being about a love triangle things turn out well for all in the end and the supporting cast love story is really funny
I hope you will like some of them.
Enjoy, Luna