I need a romance k-drama to watch!!!

Since you like It's Okay That's Love, I'd recommend another Noh Hee-kyung (she's wrote the script for IOTL) drama--Padam, Padam. It has fantasy/magical elements, but they're not exaggerated at all, and the drama has this realistic, down-to-earth vibe to it.

On the Way to the Airport is another good one, slow and low-key, but it deals with infidelity, which I understand is a big turn-off for some people.

And of course, there's I Need Romance series (three of them, but each installment is completely unrelated to one another).

By "everyday" dramas, I thought you were asking for dramas that were strictly romcom, without too many added genres, and where the comedy does not overshadow the romance. If you were asking for something different, let me know. Otherwise, here are my takes: 

Twenty Again
Coffee Prince
Cunning Single Lady
Drinking Solo
Emergency Couple
Falling for Innocence
High School King of Savvy
Marriage, Not Dating
Shopping King Louis
She Was Pretty 
Plus Nine Boys
Sweet Stranger and Me
The Time We Were Not in Love

Fight for my way and Weightlifting Fairy Kim Bok Joo!!!
These two are really realistic cute romance dramas! 100% sure you'll like them :)