Under the rusty ruins of Zaun's old city, Merlin, a "living recorder" transformed by the twisted Hex energy explosion, is endlessly tortured by the city's memory fragments. Every time he touches the old objects in the ruins, three hundred years of urban pain will flood into his mind - the tragic factory accident, the little girl in blue skirt running just before the explosion, the whisper of the scientist hiding the lost blueprint before his death... The mysterious organization "Shadow" that controls him coldly uses Merlin's ability to dig wildly in the ruins, just to seize the legendary Hex technology core blueprint that can subvert the power of the world. Under the guise of superficial compliance, Merlin pieced together clues for his escape in the gaps between each painful flashback: seventy-year-old maintenance marks in the ventilation ducts, coded rhymes unintentionally hummed by the guards during shift changes, and the repeated desperate moment in the flashback when the girl in the blue dress was finally swallowed up by the explosion. This moment not only pointed to the hiding place of the core blueprint, but also revealed the fatal energy circulation weakness of the Shadow Base. Being treated as a tool, he decided to use the painful memory of this city as a weapon to blast a bloody path to freedom between the shadow's greed and his own despair.
