Se Won, a research-obsessed brain scientist, gets devastating news that pushes him to advance a risky brain-sync system in search of answers.
Intel from a private investigator drives Se Won to conduct more brain syncs, leading him to believe his wife, Jae Yi, was right about their son Do Yoon
During the investigation of an incident, Se Won becomes a target. He learns shocking facts about Kang Moo, a private investigator who was investigating the case with him.
Hee Jin, the daughter of a man connected to Jae Yi, sheds new light on Se Won's home life and shares more details about what happened to Do Yoon.
Se Won confronts the mastermind pulling the strings behind his ordeal and setting in motion the diabolical plan involving him and his family.
Harnessing the power of his unique brain and the knowledge of those he synced with, Se Won risks his life to save his family.
