Wu Zhu's background was a mysterious mystery. According to the search results, Wu Zhu was a robot, a high-tech intelligent human left behind from the previous civilization. He was Ye Qingmei's servant and Fan Xian's protector. He had powerful martial arts and laser eyes. Although his appearance was not much different from a normal person, the search results did not provide a clear answer to Wu Zhu's specific background. Thus, Wu Zhu's background was still an unsolved mystery.