A man in his 30s who killed his mother on Lunar New Year, choosing a drink with a steady step...Video from just before the crime = South Korea

A man in his 30s who was drunk and killed his mother on Lunar New Year's Day and was sleeping next to her was arrested, but the man was seen stopping at a convenience store before committing the crime.
The man was accused of brandishing a deadly weapon and killing his mother, who is in her 50s, at an apartment in Goyang, Gyeonggi Province around 1 a.m. on the 10th of this month.
was detained on the day. The man, who was reportedly living with his mother without having a specific job until recently, committed the crime a month after he was released from prison after serving a sentence for an alcohol-related accident.
Understood. It was reported that the man went out the night before the incident, drank with an acquaintance, returned home and committed the crime in a state of intoxication, and then called his acquaintance to inform them of his crime, but CCTV footage from just before the crime was recorded.
(Security camera) footage shows the man walking steadily at the convenience store, selecting a drink and paying for it. CCTV footage released by YTN on the 13th shows the man drinking with an acquaintance and returning home.
On the way, I stopped at a convenience store, selected a drink from the liquor shelf, and walked with steady steps to the cash register. At the cash register, I took out my credit card from my wallet, inserted it directly, and finished the transaction.
Afterwards, the man killed his mother while in a drunken state, informed an acquaintance, and was immediately arrested by the police, who responded to a report from an acquaintance while he was sleeping next to his deceased mother. Although the man admitted to the crime
He is said to have been speaking incoherently about the motive behind the crime. Regarding this incident, Professor Lee Eun-hyuk of the Department of Police Studies at Konkuk University appeared on YTN today and said, ``Delusion disorder.''
It is necessary to conduct an accurate test to check whether there were any signs of mental illness such as alcohol abuse or the use of certain drugs other than alcohol, and there are certain false pretenses in order to claim mental deterioration or insanity.
It can be inferred that he may have committed some kind of act," and added, "We believe that the accumulated conflict between the family members may have been a motive for the crime, and a distorted purpose to resolve the crime."
"However, we need to investigate the motive behind the crime through an investigation." In addition, ``It is up to the judge whether to approve the so-called reduction of drunkenness (reducing the punishment for crimes committed while intoxicated).''
``There is a strong tendency recently to not allow drunkenness mitigation, so it is expected that the possibility of drunkenness mitigation due to so-called insanity or mental deterioration is extremely low.''