As the Taipei mayoral race remains deadlocked, Yu Shyi-kun said the election is a contest between two great philanthropists — one adopted a daughter, one took in a grandfather — a veiled jab at Chiang Wan-an's family background, which the Kuomintang criticized as dirty campaigning. Previously, Huang Ching-lung published a book in September questioning Chiang Hsiao-yen's bloodline, and Kuo Yi-hsi said she is willing to undergo a DNA test with Chiang Wan-an.