The documentary “Not One Less” records the clash in Hong Kong Island on 31st August, 2019, and the assembly on Mid-Autumn festival night supporting protestors in custody. The protests initiated by the "Extradition Bill" has continued for more than 100 days. In this period, over 1000 citizens were arrested, a number of people committed suicide, and there are rumors that some protestors are missing. In the clash scene, protestors strive to protect their comrades from being isolated. After the clash, they still care about their comrades in custody. On the mid-autumn festival night, they sang loudly outside the Lai Chi Kok Reception Centre, to let their comrades know that they were not abandoned.