SINGAPORE - He thought the victim in the video looked familiar, but he was uncertain.
Was that his cousin who was physically abused by a co-worker in his office?
In the video, a man was seen hitting the victim repeatedly on the cheek, trying to provoke a response.
But when the victim kept silent, he threw three more quick blows, repeatedly asking: "Why didn't you report?"
The victim, believed to be a 29-year-old university student and an intern at the office, did not retaliate but sat quietly in his chair.
Another colleague is seen telling the man, who is believed to be a supervisor, to calm down.
The video, which was uploaded on Friday night on YouTube, went viral, catching many by surprise.
One of them was the victim's cousin, who eventually decided who it likely was and alerted the victim's parents.
The parents asked their son about it, but he denied it was him.
When they saw screengrabs of the video in the newspapers the next day, they asked him again and he admitted it was him.
Upset, the parents accompanied their son to his office in Jurong West on Monday morning and confronted the supervisor, who apologised profusely, reported Shin Min Daily News.