This movie is about quarantining themselves. If they go out, they will be in danger leading to death. They must survive at any cost.

Pros:
- Makes you curious how the plot will go to the end.
- Shows you how boring is it when in quarantine.
- Gives you a thrill every second.
- Good for you who love thriller movie but don't have much time to watch.
- Good to watch together with classmates in the classroom.
- Park Shin Hye.

Cons:
- The atmosphere feels monotone since this movie takes place only in one location.
- A scene that brings a BIG question and apparently unnecessary.
- Feels too short.
- Typical zombies with no uniqueness.