Wu Zhu was Fan Xian's subordinate.
Wu Zhu was not anyone's child. He was the servant of the main character Fan Xian's mother, Ye Qingmei. He was a robot, a high-tech intelligent person left behind from the last civilization. Although his appearance was not much different from a normal person, he would not age. Moreover, he had been reprogrammed and lost a part of his memory. Thus, Wu Zhu was no one's child.
The Shadow was Chen Pingping's subordinate. He was Great Grandmaster Sigu Jian's younger brother. He had been saved by Chen Pingping and had become Chen Pingping's chief guard and personal guard. The shadow was an outstanding assassin and protector, and his strength was not inferior to that of a great grandmaster. He chose to hide his identity and act under Chen Pingping's command. Because his family had been killed by his brother Sigu Jian, he had become Chen Pingping's shadow in order to protect himself and take revenge.