A series of ”chicken shop fire mysteries”...who is the culprit? = Korea

The cause of a mysterious fire that broke out at a fried food restaurant in South Korea has been revealed.
On the 26th, the team revealed that through a joint fire simulation experiment, they had confirmed that fried food remains left over after cooking can spontaneously combust.
According to the two agencies, over the past three years, a total of 10 fried food restaurants, including chicken shops, in the Daejeon area have
A fire of unknown cause occurred at a restaurant in Garma-dong, Seo-gu on October 20th this year. When the heated oil in a deep fryer was being drained, the remains of fried food caught fire and the fire was extinguished six minutes later.
A fire also broke out at a chicken shop in Daedeok-gu, which is believed to have been caused by fried food debris, and the entire shopping district was burned down. The agency only assumed it was a spontaneous combustion, and the exact cause was not determined, so the agency
Two experiments were conducted that recreated an environment similar to that at the time, and the results confirmed the spontaneous combustion of fried food remains.
When the oil in the fried food residue mixes with oxygen, heat builds up and smoke is generated.
The plastic containers that contained the food can become deformed by heat and catch fire. A source from the Daejeon Metropolitan Police Agency said, "In the fall and winter, there is a possibility that fires will occur due to spontaneous combustion from the remains of fried foods.
"We ask fried food restaurants to dispose of fried food remains immediately after cooking," he said.