By Sarah Safsten / Nonfiction /     It was rush hour in Seoul on May 28, 2016, and at Guui subway station, a platform screen door was broken. At 4:58pm, the subway manager started a work order, promising the door would be fixed within the hour. At 4:58pm, the clock started ticking.  Mr. Kim and Mr. Jeong(1) were the technicians assigned to repair the door. At 5:20 p.m., Mr. Kim was 30 minutes away from Guui Station. Mr. Jeong, 50 minutes out, lagged behind. 38 minutes left.