The Itaewon disaster has increased demand for CPR training.

"Do you know when and where the next earthquake will occur? Can I ask for a show of hands?" During a disaster education class on Monday, Oh Jung-hwan, a drill teacher at Boramae Safety Expertise Center and a fireman with ten years of experience, said. The room, which was packed with dozens of students and office employees, was deafeningly quiet, save for a few strange expressions and giggles.

"No one knows when a calam....