Cheung graduated from the
City University of Hong Kong with a bachelor's degree in law and is a partner of Cheung & Yeung solicitors. He joined the DAB in 2000 and worked closely with the then party chairman
Ma Lik as the vice-chairman of the
Wan Chai branch, party of Ma's
Hong Kong Island constituency. He took in charge of the party's 800-member youth wing when it was created in 2004. With his young age with professional background, Cheung is a high-flier in the party. In 2011, he became the vice-chairman of the DAB. He contested in the
2003 District Council elections in
Stubbs Road but was defeated. In the
2004 Legislative Council elections, he was placed in the DAB list behind Ma Lik and
Choy So-yuk and was not elected. In
2008 Legislative Council elections, he was placed the fourth behind
Tsang Yok-sing,
Choy So-yuk and
Christopher Chung and did not get elected. In
2011 District Council elections, he won a seat in
Sai Wan constituency in the
Central and Western District Council by 24 votes against a
Democratic Party candidate. He was elected to the
Election Committee in the
Election Committee sub-sector elections through the Urban District Councils Sub-sector in 2011. He lost his seat in the
2019 District Council elections. He has been appointed to various public positions including membership on the Administrative Appeals Board, Buildings Appeal Tribunal Panel,
Central Policy Unit, Estate Agents Authority, Long Term housing Strategy Steering Committee, Standing Committee on Disciplined Services Salaries and Conditions of Service and Steering Committee on the regulation of the sale of first-hand residential properties by legislation. He is member of the Disciplinary and Investigate Panels of the
Hong Kong Institute of Certified Public Accountants (HKICPA). He was elected to
Legislative Council of Hong Kong in 2016 through the
Hong Kong Island constituency. In April 2021, Cheung criticized the
Hong Kong Bar Association, and said that the group had commented too often on political issues. On 18 June 2022, he resigned from the Legislative Council and the DAB to become the Deputy Secretary for Justice. In December 2022, Cheung said that asking the
NPCSC to interpret Hong Kong's
national security law is the "healthiest way" for the legal system to develop, after the government appealed to Beijing to block
Jimmy Lai from using UK lawyer
Tim Owen. In February 2023, after a trip to the Middle East, Cheung said that no government officials or business leaders asked him about the
national security law, and said that those in the Middle East "are not easily swayed by inaccurate or incorrect information." == Personal life ==