Leung Kin-fai

Leung Kin-fai (; 1971 – 1 July 2021) was a Hong Kong merchandiser known for stabbing a 29-year-old police officer in Causeway Bay and committing suicide immediately afterwards. The attack took place on a day when three anniversaries converged – the anniversary of the territory's handover from British to Chinese rule, the 100th Anniversary of the Chinese Communist Party, one year (and a day) after the imposition of the Hong Kong national security law. and in 2016 joined Vitasoy, where he worked as director of purchasing department until his death. The police officer was rushed to hospital in a critical condition but survived.

On his person was a USB drive where Leung had left suicide notes alleging that the police had harboured criminals, committed atrocities, and said that there was a lack of checks and balances under the system. He also expressed discontent at the lack of freedom after the implementation of the Hong Kong national security law and its ramifications on the course of democratic development in Hong Kong. The incident was classed as attempted murder and an act of terrorism by a person acting alone. Police said that a computer seized from the attacker's home indicated that he had been "radicalised".

The shares of Vitasoy, which are listed on the Hong Kong Stock Exchange, fell sharply on the day of the announcement, after Mainland Chinese social media users on Weibo called for a boycott of its products. – the lowest level since April 2020. Some mainland celebrities, namely Gong Jun and Ren Jialun, terminated their endorsement agreements with the company.

A woman holding flowers to pay tribute to Leung on 2 July, after his death.

For several days in a row, up until the seventh day, members of the public gathered in front of the Sogo department store in Causeway Bay to mourn Leung. Many wore the black shirts that had become the de facto uniform of 2019–2020 anti-government protesters, bringing white flowers, lighting joss sticks and candles. A large number of police arrived, patrolled in groups, stopped and searched citizens nearby and attempted to deter and disperse them. Police said that mourning the individual was an attempt “to glorify, romanticise, make heroic and even rationalise the blatant violence of the attacker”, and could be in breach of the national security law.

On 7 July, the students' union of the University of Hong Kong passed a motion which expressed "deep sadness" at the death of Leung, and appreciation of his "sacrifice", Arthur Li, chairman of the governing council of the university, said that the motion was "indecent and not acceptable". The executive committee of the students' union apologised for the motion on 9 July, and stepped down from their posts. On 16 July, the police national security unit raided an office of the students' union, as well as the headquarters of the university student media outlet, and on 4 August the council of the university banned from the university all 32 students who had attended the union meeting, and prohibited them from using any of its facilities and services. On 18 August, four student leaders were arrested by national security police, three of them over allegedly advocating terrorism.

In late August, Vitasoy asked its employees to agree to the collection of highly personal nature such as names and details of family members, including memberships or affiliation of associations and different organisations, failing which the company might not be able to pay workers. Vitasoy said that such data would be handed over to law enforcement departments if required. While the company said that the information was necessary as a result of a computer system upgrade and to ensure compliance, staff unions declared the move highly unusual and questioned the relevance of the information to the exercise of Vitasoy's duties as an employer.