Man in his 60s in critical condition after building fire in Mapo... suicide note found at the scene = South Korea

A fire broke out in a building in Mapo District, Seoul, South Korea, and a man in his 60s was taken to the hospital with burns all over his body. At the scene, a note was written saying that he had a grudge against the building owner. a will
was discovered. According to police, a fire broke out on the second basement floor of a six-story building in Seogyo-dong, Mapo-gu, Seoul at around 4:06 a.m. on the 27th.
Firefighters responded to the call and found Mr. A, an unconscious man in his 60s, with burns all over his body in the basement of the building, and transported him to a nearby hospital.
Mr. A, who suffered burns all over his body, is currently in critical condition. The fire was completely extinguished in approximately 50 minutes, and there were no additional casualties other than Mr. A.
A gas tank and a suicide note were found at the scene of the fire, and police are investigating the possibility of arson. The will states that he has ceased to be the custodian of the building, and that he has written a letter to the owner of the building.
It was reported that the letter stated that he held a grudge. Regarding this, the police are asking whether Mr. A actually wrote the suicide note or whether he had a history of working as a caretaker in the building where the fire occurred.
I've confirmed it. ■Major trouble consultation counters introduced on the Ministry of Health, Labor and Welfare website to prevent suicide ●Mental health consultation unified dial: 0570-064-556
●Yorisoi hotline: 0120-279-338, from Iwate, Miyagi, and Fukushima prefectures: 0120-279-226
●Life Phone: 0570-783-556