I haven't really been watching a ton of Kdramas this year but have some extra time while school is out to watch some while I wait for new episodes of the airing shows I'm watching. I'm ok with dramas from other countries too if there's something missing from my list that you really enjoyed from 2021. I'll link what Kdramas I have watched here but also a condensed version:
Completed and enjoyed
Dali and the Cocky Prince
Mad for Each Other
To My Star
Light on Me
My Roommate is a Gumiho
Dropped
Vincenzo (I'm sorry)
Hometown Cha Cha Cha (Liked the first episodes but I forgot I was watching it and probably won't finish it)
Sisyphus
Monthly Magazine Home
Oh My Ladylord (dumpster fire)
Doom at Your Service
Not Interested
Squid Game (Might watch someday but I'm not in the right mood for that)
The One and Only: It's currently airing. But even with just a few episodes out, I can already tell it's going to be a longtime favorite of mine. Without a doubt the best drama on the air rn.