Can anyone recommend any Kdramas to me?

I have about 2 weeks or so before my summer vacation is over T_T and I might spend it watching 1 or 2 dramas. 

I'm not really that picky. I will watch any genre that attracts me with the first episode. I like high school romance the most. (I'm a er for those~) But I also LOVE young adult romance dramas as well. I also watched a few suspense, crime show-like ones as well. 

The dramas can be from years ago or recent. I don't care. I also like idol dramas too. (I'm a er for those too)

The last drama I watched was called Cheer Up with Apink's Eunji. I love her! *sings twice song*

Anyway all suggestions are welcomed :)