The space-time police headed by a couple annihilated the Black Hole Sect, which was doing all kinds of evil at that time. The kind-hearted police let the four teenagers of the Black Hole Sect go, but they did not want to plant the evil seeds of revenge in their hearts. Many years later, the couple's descendant, Bogu, studied in a magic academy and met his master, Lijia, a girl who was cold on the outside and hot on the inside. The four teenagers who had been hiding in the cave to practice also turned into the four demons. They found Bogu and took revenge. Lijia helped Bogu save the day time and time again, until finally, together with other teachers in the academy, the four demons were wiped out.