This darn tear-jerker.

If you're looking for a real horror, this isn't it.
If you hate crying, this definitely isn't it.
I'd say for this movie, it's tragedy before horror. Sure, there are some horror elements, however- it's really more sad than scary.

The story is subtle. It's not deep. I have to remind you that this show's literal title is TRAIN TO BUSAN. It's a whole show about characters doing their utmost best to reach the safe zone- Busan. On a train. It lived up to its title, i'll give it that.

The acting and characters were great. Gong Yoo's acting is excellent, as expected. His character's development was amazing. He went from a selfish to selfless man that learned to truly care for others more.
Ma Dong Seok's character is as likeable here as his character in Bad Guys. You'll get fixated with his character for sure. This actor deserves more recognition.
And the most unexpected- Kim Soo An. She's an adorable and talented little actress. Then again, most Korean child actors and actresses raise the international standard for acting capabilities amongst children.
Kim Eui Seong's character is extremely unlikeable, proving that he played his role well.

The music is good. It's suitable when it's suitable.

Rewatch value: 10
Heck yeah i'd watch it again.
I can tell you that I am definitely not a fan of zombie movies but as I said earlier, it's more of a tragedy than horror. So if you're a major zombie-apocalypse-kind-of-movie fan that finds value in the horror aspect and expects this movie to fulfil it to its best, don't expect too much. The makeup is realistic and well-done.

Even if I cry my eyes out again, it's worth the watch.
If you enjoy a little bit of horror, action, thrill, a little wincey bit of comedy and quite a bit of tragedy, give this movie a go. It's one hell of a ride.