On September 4, Hong Kong elected a batch of its youngest and most pro-democratic lawmakers yet. Six new legislators, all under 40, won on platforms that called for Hong Kongers to decide their own fate. The youngest is 23-year-old Nathan Law, a veteran of the 2014 Umbrella Movement protests and a co-founder of the new political party Demosistō. What message does the election of these young legislators send to Beijing, and how will China’s leaders react?