So Remember and Cheese in the Trap has just ended and I have nothing to watch. Does anyone have any recommendation for a drama that is currently airing? I see that descendants of the sun has pretty high ratings, so I will probably try that soon. Anyone else have any other suggestions?

one more happy ending definitely ^^
Without a single doubt, you should watch Signal. If you like crime / time-travel dramas, it is the best ever made. It is rated 9.1 by 468 users. Just check the comments, it's impressive how everyone agree. Only two more episodes until it's complete.
I second Signal. I'm not watching it yet, but I've heard it's amazing ❤
I highly agree with Signal. Best korean drama I've watched so far :)
You should definitely watch Signal. 
i am watching Please Come Back, Mister (2016) and I was in tears laughing because its so funny. highly recommended (^_^)
  
Descendants of the Sun
Six flying dragon! No doubt! Intense, action pack, bromance, sprinkle of romance and of course politics
Please Come Back, Mister 
Signal and Six Flying Dragons. Sadly both dramas are ending soon.
Definitely SIGNAL! ???? 
I came here only to fangirl about DotS, I'm glad you'll be watching that. Others I'm following are One More Happy Ending and Madame Antoine, but they've been quite underwhelming...

Previous posters have convinced me to try out Signal :D
Signal, for sure!! I'm also watching Madame Antoine because it's light and fun. OMHE started out good, but I decided to put it on-hold for now. It's frustrating to watch.