“Why are they singing Japanese songs?”…A man in his 50s brandished a deadly weapon at other customers at a bar = South Korea

In South Korea, a man in his 50s was arrested by police after he brandished a deadly weapon at another customer at a bar because he was angry that he had ``sung a Japanese song.''
According to the police on the 22nd, Wansan in Jeonju, Chollabuk-do (Jollabuk-do)
The police department applied for an arrest warrant against A, who is in his 50s, on suspicion of brandishing a deadly weapon at other customers at a bar (attempted murder). Suspect A assaulted Mr. B, who is in his 50s, at a bar in Wansan-gu, Jeonju City around 1 a.m. on the 21st.
He is accused of brandishing a weapon and causing injury. Mr. B suffered injuries to his stomach and other areas and was taken to the hospital, but his injuries were reportedly not life-threatening.
The police responded to the report and arrested A, who was drunk, red-handed.
Suspect A is said to have made a statement to the effect that ``I was annoyed that another customer was singing a Japanese song.''
Police are investigating the exact circumstances of the incident from Suspect A and witnesses.