System novels usually referred to novels where the protagonist received a mysterious system that granted the protagonist various abilities to help the protagonist complete various missions. In system novels, the system was usually an intelligent program that could control the actions of the protagonist. The protagonist could grow and improve through interaction with the system. The main features of system novels included: 1. The protagonist gets a mysterious system. The system can give the protagonist various abilities to help the protagonist complete various missions. 2. The system is usually an intelligent program that can control the actions of the protagonist and the protagonist can grow and improve through interaction with the system. The missions in system novels were usually more complicated and required the protagonist to use all kinds of wisdom and abilities to complete. The protagonist will usually encounter various challenges and difficulties that require constant interaction with the system and seeking help to overcome. 5. System novels often involved various fantasy and sci-fi elements, including magic, machinery, and the future. System novels were a popular genre that was loved by young readers.