It was a tolerable movie, but by Korean standards, the acting could have been much better. Why the director of Train to Busan hasn't been able to produce another compelling narrative with compelling actors since then intrigues me. I have low hopes when they mention the filmmaker because, since then, he has been producing films that are comparable to Korean B flicks. Very disappointing movie. It failed to adhere to any of the themes it developed. It's half-assed action, half-assed drama, half-assed science fiction, and any attempt at philosophy was at best quarter-assed and much less interesting than others who handled it well. The two main characters caused the emotions to range from serious to lighthearted. Because of the weak setup, it couldn't even make an emotional impact.