The Trickster with Zero Fitness

Changes are shrouding the world, and strange things are growing everywhere. The official relies on the matching suitability of the trick library to select the orthodox trick masters. Xu Tian's fitness approached zero infinitely, and he was abandoned by the entire system. But what no one knew at the time was that he had a top alien species lodged in his body. If you want to stabilize yourself and resist the backlash, the only way out is to use other tricks. Wandering between the people and the control bureau, while fighting for life, he also explores the truth behind his parents' disappearance during the mission.