I regretted watching the whole thing. The only reason why I watched it is because of the spoiler shorts you see which were propaganda and an illusion.
From the start, I never liked any key characters, the ones you hoped out of it alive and unharmed.
The story was an utter mess like it was rushed and they needed to draw people's attention. Why use children as I'm sure that would never happen in real life. The mental health part I enjoyed as it showed the effects yet they didn't go into enough detail and too characters were experiencing it. In a time like this, it strengthens communication and leadership and yet every character lacks the key skill. Where was the division in roles? The strong go with the weak. Would've loved to see some friendship in this time of hardship but got strangers that were in constant conflict
What happened to the rest of Korea's population

Look the aliens were interesting as they were scary and seemed incredibly strong but they found key findings that were never used against them. I'm surprised they stayed in the end as I know I would run the first chance I could