Baggio Leung was soon disqualified from the office due to his oath-taking controversy, followed by Leung Kwok-hung who was also disqualified for his oath-taking manner. A by-election was held in March 2018, where Gary Fan made a comeback by defeating Tang Ka-piu of the pro-Beijing Hong Kong Federation of Trade Unions (FTU). However, Fan was later unseated by the court in December 2019, as the court viewed pro-independence candidate Ventus Lau's disqualification in the by-election was unlawful.