This series caught my attention because of the "sci-fi" setting and Gong Yoo. This man had done a lot of genres so I had quite high expectation for his performance in this. However, the characterization was disappointing, not just him but the entire characters in the show. Not like it was the actors fault. I just feel like it's a waste to have these amazing casts in the same show and not giving their characters an interesting personality & depth to make the audience feel attach.
Plot wise, I genuinely love the idea of making "our everyday needs" as dangerous substance that can't even be touched. It was interesting. The mysteries surrounding the accident in the station, how human bodies react to the substance. But then, it started to get boring when LUNA 073 appeared and they suddenly focused more on being a parent figure for her. Instead of LUNA origin and her "antibody" card. I want an explanation regarding the lunar water and what would happen if they did bring it to earth. Would it react the same under different circumstance?
Overall, I enjoy this but I feel like things would have been better if they give more details.