The main ancestors often migrated repeatedly. The reason why Cantonese people are called "Hakkas" is mainly related to repeated migration. They are wandering around and have no fixed place to live. No matter where you wander, you are a "guest" to the local people. As guests, the local people around have their own unique customs and habits, but when these new "guests" move here, the dialects, customs and other cultures of the two places will conflict, which will arouse the resentment of the local people and lead to contradictions and conflicts.