I am kinda picky when it comes to dramas.

Is there any drama that has realistic storyline and we won't get bored from the start to the end? Thanks~

I recommend you to watch Empress Ki because the story is based on real-life events and never gets boring ^^
- Misaeng: The travails of regular office workers in a general tradings' company.
- Yoona's Street: The life of a group of people living together in a lodging house.

Both have realistic story and plot (well, as realistic as a drama can be). As for not making you bored, well, boring is relative, really :p. I didn't find them boring, but if slice of life isn't your cup of tea, you might find them too slow for your liking.
Six Flying Dragons is the best written show I've seen in a long time - complex characters, great pacing, and powerful payoffs. The Devil, Giant, and Tree with Deep Roots also feature excellent writing. If you're looking for slice of life realism, I'd recommend Alone in Love.
I am also quite picky especially after finishing an emotionally painful masterpiece.

 MY RECCOMMENDATIONS:
Signal
Cruel City
Splash Splash Love
Cheese In The Trap
School 2015: Who Are You
Healer
Cheer Up/Sassy Go Go