I started watching this Drama because of its name which attracts me the most.

Story- It all about the River Valley in which a bus fell because of an accident in which only 6 people survive and was trapped in the River Valley. They attempt to find a way to escape but they couldn't. And they also find some strange things happening with them in the River Valley.

At first you may get confused with the story but after some episodes it will be fine. You have to watch each and every episode with patience then only you can get the story.
The back story of the characters may get sometimes irritating but its fine.
In my opinion this is the best sci- fi and mystery drama I have ever seen.
I should also appreciate the acting of all the actors.
If you want some rest from the rom- com dramas then this is the best Drama.
Eagerly waiting for the second season.