The "Anti-Extradition Law Amendment Bill Movement" in Hong Kong has been going on for half a year since the occurrence in June 2019. Until the spread of the KOVID-19 in Wuhan, the event had to temporarily suspend large-scale protest activities. Although the event appears to have subsided, the nature of the movement has not ended. The event involves the exploration of a core theme: why is the event spreading throughout Hong Kong and are participants more dominated by young people? Is this issue closely related to "one country, two systems"? This article attempts to answer these questions from the development trajectory of the event, but because the full picture of the event cannot be understood, this article is only an preliminary observation, and its future development will be left for future observations.