Firstly I waited and watched the whole dram to give an honest opinion , to be frank the plots is a great plot yes it's sci-fi but it was a great story however i can't say that about the production, the action scenes seemed pretty artificial and surreal, the way the events rolled was idiotic in my perspective, i felt like the kdrama held alot of mistakes regarding the process of the story. The first couple of episodes did seem greater than the rest of it plus i was very disappoint, my favourite character died in a stupid way ( sul min joon ), it wasn't even explained it seemed like it just happened to fulfill the gaps, I'm honestly veru angry and not satisfied at all .