Let's see if I can be of help. I checked your "Completed List" I'll try to add dramas you have not watched.
Beautiful Gong Shim- Super sweet drama, male lead is head over heals for the female lead. It has a little bit of makjang but nothing too bad.
Man to Man- Awesome bromance, you might not care much for the female lead but the rest of the drama is great.
Marriage, not Dating- Contract relationship, hilarious humor, awesome chemistry. The female lead poops her pants due to food poisoning in front of the lead that is still the most hilarious thing I've seen.
My Only Love Song- It is a short drama but you should give it a try. It's full of fluffy moments and the chemistry is fire.
My Sassy Girl (2017)- Another fluffy historical romance with great comedy.
Sungkyunkwan Scandal- Hilarious historical drama, you have to watch this.
Rooftop Prince- It has a little bit of seriousness on some parts but nothing too bad. The drama is super funny.
Dramas from other countries you might want to give a chance.
5-ji Kara 9-ji Made- Super light watch, it doesn't have very serious plot-lines .
Bromance- Cross-dressing female lead, confused male lead. Amazing comedy and great chemistry.
Hi, My Sweetheart- Goofy male lead and badass female lead.
Marry Me or Not?- Lots of hot moments between the leads, the female lead is a strong independent woman. Super funny scenes too.
My Amazing Boyfriend- Funny supernatural drama with awesome chemistry and romance.