Brothers. According to the relevant information of the novel "Peaceful Life in the End of the World", Zhang Bao and Zhang Sheng are biological brothers. The two are the protagonists in the novel "Peaceful Life in the End of the World". The novel is poignant and true, and the ending is extremely shocking. Summary of content: On August 16, 2020, Zhang Bao pointed at himself and Zhang Sheng, and introduced to Du Qiuping enthusiastically. Zhang Sheng did not refute Zhang Bao's introduction, and nodded to Du Qiuping in acquiescence.