The CGI is pretty good but this drama is so full of things that annoyed me.

It started off pretty well and gave us enough exposition to explain the current situation, but suddenly stuff goes sideways and we see how inept and pathetic the Republic of Korea Armed Forces were. They are so undermanned that they had to rope in 3rd year High School students to help fill in the numbers.

Now these kids.... they make some really stupid decisions that had me asking if any group of rational people would make the same decisions they did. And some scenes made no sense, like in one scene they were stuck in a garage and the danger was coming in through the roof but the car keys were stuck behind a cabinet. They made it very clear it would be in any moment and yet found 10 minutes to draw lots to determine who would be bait and lure it away so somebody could try to grab the keys... the same amount of time they could have easily moved the cabinet and grabbed the keys! That is just one of many idiotic moments that had me cursing at my TV.

Best moment is the huge sacrifice at the end. Really emotional and was a great way to end part 1.