At around 20:00 on June 22, due to physical discomfort, Li Guoqing asked for leave from Huizhou Chengtong Automobile Transportation Company where he worked, requesting to rest for a few days, and received permission from the team captain. At around 16:30 on the 23rd while resting, the team captain called Li Guoqing asking him to work overtime and replace another driver. Li Guoqing initially disagreed, but later the team captain called Li again, insisting that he must substitute for the other driver, and Li reluctantly agreed. Subsequently, Li went to the main station of the bus No. 889 at the train station square to wait for his shift. After waiting for more than an hour until 18:24, the bus No. 889 finally returned. Upon arrival, Li was visibly angry, and without waiting for the conductor to board, he directly started the bus and quickly drove towards the city along the normal route of the bus, causing the incident to occur.