This drama is much more interesting and mysterious than I expected. I'm surprised the rating is so low. The plot reminded me of a movie The Maze Runner. But this is the first season. And I am waiting for the continuation of this story.
This drama isn't historical. There are only a couple of scenes from the past live of the leads. It is a modern business rom-com with an indefinite ending. Maybe there will be a second season. But it isn't bad, quite interesting.