He Chen, a sophomore in high school who is always at the bottom of his grades, unexpectedly acquires the "Eye of Truth" - the ability to see through the cause-and-effect chain of things and the true identity of the golden finger user. When the Western fantasy world came to the city, magicians, knights, and alchemists disguised themselves as ordinary people and lurked on campus. He Chen's daily life began to collapse.
In a bizarre "disappearance case of a top student," He Chen discovered with the Eye of Truth that the missing person was turned into a puppet by a black magician. The police concluded the case as "run away from home", but he was the only one who persisted in pursuing the case. Faced with the bullying of the school bully, the doubts of the teachers, and the disappointment of the parents, He Chen relies on the reasoning of the causal chain to gradually uncover the fantasy black market hidden under the city - where forbidden arts are sold, souls are traded, and monsters are created.
