I'm speechless and still crying. This is by far the best zombie movie I've ever seen. No wonder it has so many 10 ratings... but I just can't give it a 10 even though I'd like to. The reasons are:

- So many things were left unexplained. For example, what happened after the outbreak? Did humanity in general managed to survive? How exactly was the virus caused (we only know WHO caused it)?
- I'd have liked to see the survivor's lifes years later. Surviving that kind of thing is obviously traumatic and I'd have liked to see how they kept living (if they did).
- Even though my eyes felt like they were glued to the screen (I just couldn't stop watching), I noticed some things that just don't make sense. I won't say which ones are because I want this to be a spoiler-free review, but if you watch you'll most probably find them.

Everything else in this movie is perfect. The zombies look real af, the reactions of the people trapped on the train, their feelings... everything is amazingly portrayed. I have nothing more to say than go watch 'Train to Busan' right now. You're missing one of the best action movies ever.