Well, this is based on a novel and it was going to be a movie but the director thought that 2 hours wasnt enough to tell the story that's why they decided to make a tv series. Im pretty sure that 8 hours is enough to tell the story.
I wonder if its going to be mostly comedy? Considering the feeling of the teaser
What can I say, don't believe the trailer until the drama on broadcast.. Originally main genre is thriller.. I expect they put comedy little bit not much