Train to Busan, Flu are two very good Korean movies. There are plenty of good Korean movies out there. This one is not one. It can not be taken seriously. The story is highly flawed. The lead actor was simply not qualified for the role. He was suited for a romance melodrama. The lead Role also was highly flawed. An army Seal and Astronaut panicking crying losing control etc...
No one in Korea Space agency seemed to have the right character to manage any emergency. To make it more embarrassing right at the beginning they are begging NASA for help. Have some self reliance national pride and dignity! Every major news event had to be repeated in English to be given credibility and importance. It seems unless the event is repeated in US news is not worthy.
The acting is bad plot is well unwatchable, special effect is good if you forget laws of physics.