Where did those people escape after overthrowing the Tang Dynasty? Guangdong? Fujian?

In the Tang Dynasty, most people from the north flowed to Sichuan, Jianghuai, Fujian and Guangdong, and Guanzhong, Hebei and Henan were all battlefields, that is, when Hakkas came into being. Huaixi people flowed into Fujian to establish Fujian, while northern declining warlords fled to Yangzhou, some literati fled to Sichuan, such as Zhang, some fled to Fujian, such as Hanwo, some fled to Jiangdong gifted scholar Wu, and more noble ministers fled to Guangdong and Guangxi at the end of the Tang Dynasty.

Do you mean the dynasty of Wu Zetian in the Zhou Dynasty or the dynasty established by Ji Fa? After the overthrow of Wu Zhou, most of Li's people returned to Beijing from exile to reply to Jue Lu. Some officials who can't return to the DPRK have settled in Lingnan, while others have taken root in frontier minority areas. The Zhou Dynasty in the list of gods naturally perished. During the debt-ridden Zhou Nanwang period, the Eastern Zhou Dynasty was divided into two kingdoms, which were later destroyed by Qin and other vassal states, and the royal family finally moved to Qin!