Dr. Sewon, a neuroscientist consumed by inquiry, receives a blow that shatters his world. Driven by a desperate need for understanding, he throws himself into developing a perilous brain-synchronization system, hoping it will unlock the ans…

The information gleaned from a private investigator spurred Sewon to undertake further brain synchronization sessions. These sessions fostered a growing conviction within him that his wife, Jaeyi, had been correct regarding their son, Doyoo…

As Sewon delves deeper into his inquiry, he finds himself marked, and uncovers a troubling truth about the private investigator that profoundly unsettles them both.

Heejin, daughter of someone close to Jaeyi, offers a fresh perspective on Sewon's domestic life and reveals further details regarding Doyoon’s fate.

Sewon finally faces the architect of his suffering, the one who orchestrated the intricate scheme ensnaring him and his family.

Drawing on an exceptional mind and the shared knowledge of those he connects with, Sewon undertakes perilous actions to protect his family.