Chapter 4
Heejin, the daughter of a man connected to Jaeyi, sheds new light on Sewon's home life and shares more details about what happened to Doyoon.
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More from this season
S1 E1
Chapter 1
Sewon, a research-obsessed brain scientist, gets devastating news that pushes him to advance a risky brain-sync system in search of answers.
S1 E2
Chapter 2
Intel from a private investigator drives Sewon to conduct more brain syncs, leading him to believe his wife, Jaeyi, was right about their son Doyoon
S1 E3
Chapter 3
Sewon's investigation makes him a target, and he discovers a disturbing truth about the private investigator that rocks both their worlds.
S1 E5
Chapter 5
Sewon confronts the mastermind pulling the strings behind his ordeal and setting in motion the diabolical plan involving him and his family.