The group's manager, Mr. Park, who was driving the van, had been speeding, driving 137 km/h in a 100 km/h zone for a distance of 30 km. Rainy conditions made the road slippery, which caused Park to suddenly lose control of the vehicle, causing the group's van to hydroplane and skid several times before crashing into a protective wall in the vicinity of the Singal Junction on Yeongdong Expressway.