Bobai Zhu's surname is 28.

The reason why Bobai Zhu's surname is twenty-eight refers to a family struggle in Bobai County in the Qing Dynasty.

According to legend, Bobai Zhujiajian was a noble family in the Qing Dynasty, with a lot of land and wealth. However, there are serious contradictions and disputes within this family. Among them, the contradiction between Zhu, the head of the Zhu family, and his cousin Zhu is the most intense.

Zhu is a man with a strong desire for power. He tried to consolidate his position and power through family struggle. He constantly expanded his influence by using family power, and even suppressed and excluded other families with surnames.

Zhu is a man of strong character, and he is unwilling to endure Zhu's oppression and exclusion. So, he combined the names of 27 other families and * * * opposed Zhu's family power. This struggle led to the division and weakness of the Zhu family, and also caused serious damage and loss to other surname families.

Finally, Zhu and his allies defeated Zhu's family power and Zhu was exiled to a remote area. However, this struggle has also brought serious turmoil and instability to Bobai county society, leading to social chaos and division.