Adults-only game center locked and set on fire... 1 dead, 4 injured = South Korea

A fire broke out at an adult-only game center in South Jeolla Province, South Korea, leaving one person dead and five injured.
According to fire authorities, on the 1st, at around 1:29 pm, a fire broke out at Yeongam-do, South Jeolla Province.
A fire was reported at an adult-only game center on the first floor of a store in Samho-eup, Awang-gun. The firefighters who were dispatched to the scene put out the fire in about 20 minutes, but the game center
A Chinese man in his 60s was found dead inside the center. Four other employees and customers who were inside at the time were rescued with minor and serious injuries, one of whom is in critical condition.
The investigation revealed that the suspect in the arson incident was Mr. A, and that he had scattered flammable materials and then set the fire.
At the time, Mr. A locked the entrance, preventing the people inside from escaping, resulting in casualties.
It was reported that a witness had stated that "Mr. A lost his money and caused an affair." The police are investigating the exact circumstances of the incident and are investigating the existence of a money exchange at the game center.
They also plan to investigate whether any illegal business activities were taking place.