Ong was also the Confidential and Political Secretary to Member of the
Selangor State Executive Council (EXCO) and MLA for
Kinrara Ng Sze Han for 5 years. However, he joined the team of Ng in 2013 and has worked with him even before he was appointed his secretary for about 10 years. When he was the Member of MPSepang, Ong organised children activities that were also attended by parents and provided chances for the community residents to form closer relations. During his tenure as the secretary to Ng, Ong helped the Selangor people to register for welfare programmes of the state government of Selangor, handled the transfers of schools of students, visited patients and attended other community activities.
Member of the Selangor State Legislative Assembly (since 2023) 2023 Selangor state election In the
2023 Selangor state election, Ong made his electoral debut after being nominated by PH to contest the Balakong state seat. Ong won the seat and was elected to the Selangor State Legislative Assembly as the Balakong MLA after defeating Steven Lai Choon Wen of
Perikatan Nasional (PN) by a majority of 37,832 votes. As the Balakong MLA, Ong pledged to become the bridge between the people, traders and the state government, advance the industrial areas in Balakong to meet the
Fourth Industrial Revolution (Industry 4.0) target, establish neighborhood culture and strengthen community bonds in Balakong. He also revealed that one of his predecessors as the Balakong MLA Eddie Ng Tien Chee was his role model in his work as the Balakong MLA. File:Wayne Ong Chun Wei and Kelvin Yii Lee Wuen smiling and making fists.png|Ong and
Member of Parliament (MP) for
Bandar Kuching Kelvin Yii Lee Wuen standing, smiling and making fists in Selangor, Malaysia on the Nomination Day of the 2023 Selangor state election on 29 July 2023. File:The 2023 Selangor state election campaign poster of Ong.png|The 2023 Selangor state election campaign poster of Ong with the
Malay slogan of "Balakong! Ada ONG!" (literally "Balakong Has Ong", referring to Ong contesting in Balakong) in his election operations centre in
Balakong, Selangor, Malaysia. == Personal life ==