I need a feel good romance stat!

I recommend Weightlifting Fairy Kim Bok Joo if what you want is something fluffy, light-hearted, and funny.
Reply 1988 if you want something funny and heartwarming and that'll make you feel nostalgic.
Marriage, Not Dating if you want something funny, but kind of silly.
You're Beautiful is also light-hearted, but only if you have patience for a dumb female lead and a really annoying second female lead.

I also recommend:
Age of Youth
Something About 1%
Sassy Go Go
Shopping King Louie
Doctors
Go Ho's Starry Night
Splash Splash Love
High School King of Savvy
Love O2O
My Sunshine
Bromance
Marry Me, or Not?

Anything Reply series is guaranteed to be a cut above the rest, tbh.

But....My Girlfriend is a Gumiho is GREAT too. Try Sassy Girl Chun Hyang if you like the former -- they're both from the Hong sisters & imo their two best works!

@jak: my rankings of the series are exactly the same as yours. I hope they come back with a new one soon, it's time!!! :'(((

ONGOING:
My Secret Romance
Suspicious Partners

Completed:
Missing You
Weightlifting Fairy Kim Bok Joo
Strong Woman Do Bong Soon
Legend of the Blue Sea
Go Ho's Starry Night
Descendants of the Sun
49 Days
I Hear Your Voice
Innocent Man
It's Okay, It's Love
My Love from the Star
Pinocchio
Secret
That Winter, The Wind Blows
W