Hong Kong's "long red" was introduced from Guangzhou in the late Qing Dynasty, but Hong Kong people no longer know the original meaning of "long red".

In Guangzhou in the Qing Dynasty, people's autonomy in workshops was widely practiced. Just like today's community, the studio has doors, group exercises and value issues. At the same time, every workshop has a temple, and the discussion of people in the workshop is called "temple discussion". When someone needs to convene a temple fair to handle the affairs in the workshop, it is usually done by "signing". But there is also the highest form of convening, that is, posting "Long Red". The function and significance of Guangzhou's "long red" are similar to the "chicken hair letter" in the novel "White Deer Plain".

Therefore, "Changhong" should be the highest authority in Guangzhou in Qing Dynasty. However, the "long red" scene among gangsters shows that Hong Kong people have forgotten the meaning of "long red" under British rule, and the spirit of civil society autonomy is only the residual memory of the underworld.