HONG KONG — The Hong Kong government does not usually weigh in when the tabloids catch a pop star cheating.

But this week, after the city was riveted by the scandal of a married singer caught on video kissing an actress, some government agencies were criticized for using it as fodder for jokes in public service announcements.

A local newspaper, Apple Daily, published blurry footage online that it said showed the singer, Andy Hui, 51, cuddling in a car with Jacqueline Wong, a 30-year-old television actress. Mr. Hui and his wife, Sammi Cheng, a singer even more famous than he is, are royalty in the world of Cantonese pop music, or Cantopop, and the video was the talk of Hong Kong on Tuesday.

Image At the news conference, Mr. Hui called himself “disgusting” and “rotten.” Credit... Vincent Yu/Associated Press

That evening, Mr. Hui apologized at a news conference that was broadcast live, calling himself “disgusting” and “rotten.”