How long have you been studying korean? and how much do you understand when watching kdramas? About what percentage? :)
here's my recommendations..
Cheese In The Trap - Although it's not yet finished airing, this has variety of vocabulary, from school, home to work and relationships. The script's also very natural. I personally learned a lot of vocabulary and grammar from reading the webtoon where this drama is based, so i'm pretty sure you'll learn a lot from this drama too.
Potato Star - This is a really funny sitcom / family drama. The episodes shows their daily life including work, love, family, and there's a lot of cast, from young to old characters, so you'll get various vocabulary here and culture too. The people here bickers often, so they might speak a little fast sometimes but it should be ok :) I remember learning a lot of useful words here, specially the word "Gil-Chi" meaning "directionally challenged" or bad at finding roads.. That word i learned made it easy to tell my korean friends who asks me to show them around to my country haha.
Let me know if you have anything else i can help with. Good luck! :)