After Zhou Wuwang conquered Shang Dynasty, he left Zhou Wang's son Wu Geng. King Wu was not at ease, so he sent his three uncles, Guan Shu, Cai Shu and Huo Shu, to watch him, which was called "Three Supervisors". After the death of King Wu, Zhou Chengwang succeeded to the throne, while King Wu's younger brother Zhou Gongdan took over the political power. Zhou Gongdan's regency aroused the dissatisfaction of Guan Shu and others. They spread rumors that Zhou Gongdan tried to usurp the throne. After hearing these rumors, Wang Cheng also began to doubt. In order to avert suspicion, Zhou Gongdan left Haojiang and came to Luoyi, the eastern capital. Wu Geng was unwilling to die in Shang Dynasty and wanted to make a comeback. When he saw the contradiction between the Zhou brothers, he sent people to collude with the "three prisons" to rebel. When Zhou Gongdan learned about this, he wrote a poem "Owl" and gave it to Wang Cheng, telling the significance of saving for a rainy day. The main idea of the poem is: "Owl, owl! You took my son. Don't ruin my home again. Before it rained, I was busy peeling mulberry roots and repairing doors and windows. " The owl in the poem