Kowloon, since ancient times, nine has been an extreme number in China, and some novels will also mention 50th Avenue and 49th Heaven Road. During the feudal period, the clothes worn by the emperor were embroidered with Kowloon patterns, which represented a very high peak power.
As for the appearance of Kowloon together, it seems that most ancient books have not recorded it. According to legend, when Xiang Yu, the overlord of the Western Chu Dynasty, was born, there was a black dragon.