What Zhou Wang slaves are there in Nezha?

The character is Nezha's legendary Ji Fa, a friend of Nezha.

According to LeTV, Ji Fa is the son of Xibo Hou Jichang, the founder of Zhou Dynasty and a good friend of Nezha. Born into a noble family, he was held as a slave in Chao Ge by Zhou Wang when he was very young. His life is always in danger, but he is always indomitable. Too many hardships have created a strong and steady character.

Ji Fa was resolute, firm, faithful and loved the people, and eventually led everyone to overthrow the brutal rule of Zhou Wang.