In a modern metropolis, a private reasoning team called the "Decryption Bureau" composed of former police officers, forensic doctors, psychologists, hackers and criminal investigation veterans is hired to investigate various complex cases. Driven by unsolved cases and mysteries from ten years ago, the team continues to solve new cases, revealing power, desire, hatred and redemption. Multi-line stories are interspersed - the team members' secrets and past unsolved cases gradually surface, and their respective struggles and growth are intertwined in the ensuing death mystery. In the end, everyone has to face their deepest fears and obsessions, and choose the final dividing line between justice and truth.
