The plot suck. The writer need to do it better. I know human tend to forget about something so basic or what they learn like how did you expect me to believe a professional astronaut want to open the door without their suit in the middle of space? That's instant death there. The writer follow human's weak emotions too much. Other than that, everything was amazing. Especially, the acting. The acting was topnotch. As expected from Kyungsoo, sungkyu and kim hear. I wish to see more of them in the next project if possible.