[9] Wang contested the 2019 by-election for a vacant Legislative Yuan seat in Taichung's fifth district on behalf of the Democratic Progressive Party,[10][11][12] and lost to Shen Chih-hwei [zh].

[19] While in this position, Wang stated on a political talk show that the Democratic Progressive Party could use mobile phone data to determine the ages of protesters participating in the 2024 Taiwanese constitutional controversy demonstrations.

[20] These comments drew attention in the Legislative Yuan and National Communications Commission,[21][22] as well as criticism of Wang by the Kuomintang and Taiwan People's Party.

[23] Wang himself criticised Kuomintang politician Andrew Hsia for visiting China, and the Taipei City Government for a subcontract signed with Taifo during the mayoral administration of TPP founding chairman Ko Wen-je.

"[29] In November, Wang was appointed to the Legislative Yuan, replacing Hung Sun-han, who was elevated to labor minister upon the resignation of Ho Pei-shan.