The setting is impactful in every genre but beyond critical in horror films. Countless stories have been crafted by taking an existing scary movie and changing the background. Beloved monsters like zombies and werewolves are the go-to elements to slot into a new location. Paul Hyett's Howl and Yeon Sang-Ho's Train to Busan follow ragtag groups of people fighting ravenous monsters on trains. They have more in common than one would think.