In a World Invaded by Ghosts, I Have the Power to Control Ghosts

In the history of Azure Star, people with spiritual powers have a one-thousandth chance of becoming ghosts after death. But the power and existence of ghosts are not long, and they have not excessively affected the history of this planet. But in the past fifty years, the number of ghosts has increased sharply, lasting longer and becoming more powerful. And most ghosts have hatred for this world, and this world is beginning to develop in the direction of destruction. At this time, Liu Yan, an earthling who brought a card that could seal ghosts and controlled the ghost general summoner, came to this different world. But for some unknown reason, the guidance system in the Ghost General Summoner was damaged. Bad news, the guidance system can no longer guide the time traveler to become stronger. The good news is that because the guidance system is damaged, the ghost has opened all other system permissions in the summoner and can use them all without completing the tasks given by the system. But without guidance, it became a problem for the time traveler Liu Yan to use his power in this strange world. "Becoming a hero, can I do it by my own will?"