In a certain super-large modern city, people continue to encounter unexplained "brain events": phenomena such as consciousness dislocation, fantasy materialization, time anomalies, and spiritual resonance. Five people with different personalities and different lives were brought together by fate. They fell into a surreal puzzle either because of their knowledge, accident, or identity. During the investigation and pursuit, they discovered that behind the scenes there was not only the covetousness of the huge chaebols and scientific research groups, but also the deep collision of psychology, human nature, and class. As the incident deepens, the biggest secrets, fears and growth in each of their hearts are revealed one by one, revealing the deepest truth in the city and people's hearts: what is reality and what is illusion.
