It's a very heart warming romantic comedy about two people who need to get over their painful first loves. They also make fun of traditional kdrama tropes a little -- it's so funny! For those who have watched Crash Landing On You, you'll find special sentimental value in the references (and perhaps some closure... you'll know what I mean after watching the first 5 minutes)

Both leads are seasoned actors already but this puts them under a different light -- Seo Jihye, who is almost always "the rich and proper/cold second female lead," plays a completely different personality in this drama; and Song Seung-heon, whom I honestly only remember vaguely from Autumn In My Heart, also gets to show off his comedic side with this drama. Both the chemistry and the comedic timing are impeccable, and the show has me laughing really hard every week. The two second leads are also well-chosen for the role, even though it's my first time watching either of them act!
And omg the older couple (you'll know who I mean) -- comedic value A+

There aren't a lot of songs in the OST, but the few songs truly convey the vibe of the scenes they're associated with, and I would put the songs on repeat! Would also rewatch the particularly funny scenes -- omg those CLOY references are A+!

I would say this is a great show in the rom com genre, and is a must-watch if you liked Seo Jihye in Crash Landing On You!