Hui became well known during the 2014 Occupy campaign, when he started to give daily televised updates from 30 September 2014 as Chief Superintendent of Police.
[8] In November 2015, Hui left the bureau to become district commander in Sham Shui Po.
[9][10] After leaving the police, he was appointed as a managing director of Sun Bus (a subsidy of Transport International, which is also the parent company of Kowloon Motor Bus) and later also the chief administrative officer of Transport International in 2019.
[12] The Hong Kong Hotels Association appreciated the work done by TST Division to achieve a 20% reduction in hotel crime between May and June 2008, presented Certificates of Appreciation to Hui along with three officers of Yau Tsim District.
[13][14] Hui studied biology at the Hong Kong Baptist University.