Yoo Ah-in carries the first half almost alone, and he is very good. Joon-woo is not a hero. He is a young man who never had to look after himself, slowly running out of food, water and hope. His drone flights and live streams make him feel very modern.
The film picks up when Park Shin-hye arrives. Yoo-bin is calm, prepared and deadly with a hatchet, and their friendship across two balconies, talking by walkie-talkie and laser pointer, gives the film its heart.
The zombies are fast and vicious, and some keep habits from their old lives. The set pieces, like a zip line between buildings and a dash through a stairwell, are well staged and tense. The violence is bloody but not extreme.
The weakness is the story. After a strong first hour, the final act leans on a familiar human villain and a very convenient rescue. It is not as clever or emotional as Train to Busan, but it is a tight, entertaining 98 minutes.







