The story will really bring you into your curiosity. There are various events that would made you ask "why/how" with an exclamation point! At those times I wish I could binge watch this but can't (been waiting patiently for subtitles ). There are various flashbacks happening that might be confusing at the beginning or might be, yes, annoying at some point. But I believe if you feel like wanting to solve what is, then you certainly would not want to miss a detail that might be a hint to whatever the mystery is. You'll bear with it and will get used to it as the story goes.

This last point that I will mention doesn't really affect the plot that much. On a technical side, there's a CGI in episode 1 or 2 (can't remember exactly on which episode it happened) where you will feel like.. 'just when everything is getting better, here comes this scene that would made you say that, they should have made the CGI better.'