HONG KONG, Sept. 24 -- Hong Kong singer William So Wing-hong has broken his silence following the cancellation of his upcoming concert in Wenzhou, China, due to a decades-old drug scandal.

In a social media post yesterday, a day before his 58th birthday, So wrote in Chinese: "Please allow me to sincerely apologise again. Because of a mistake I made 23 years ago, I've recently again used up some public resources, causing everyone to expend their energy on it. I am sorry."

So was arrested in 2002 for taking Ecstasy at a Taipei pub and later sentenced to 11 days of drug rehabilitation.

Reflecting on the incident, he said: "I deeply understand that the stain of a mistake can never be erased. In the past 23 years, not a single day has passe...