Part 4/7:
Collecting Clues and Connections
As the investigation deepens, Mark partners with Mina, who is now a prosecutor. The two have become familiar yet distant, as Mark harbors the secret concerning her father's death. As they work together, new suspects emerge, specifically focusing on Mina’s former stepbrother Lee Wook, whose altered mental state raises alarms as his past tracks back to intertwined connections with the case.
Mark and Mina uncover clues that lead them into dark alleys of their history. When the investigation hints at the possibility of a serial killer operating across parallel universes, they face an impending nightmare. As they connect lives lost, unspeakable truths about their pasts arise that change their understanding of crime and justice forever.