In Xinjing City in 2086 AD, emotions, memories and knowledge can be extracted as "concept crystals" for trading. This is an era where "concepts" are used to define value.
Lin Yao, an ace agent whose future was ruined, is now a private detective who lives with alcohol all day long. He lived in the shadow of his wife's death three years ago, until a strange commission dragged him into the abyss again - a crystal symbolizing "nothingness" was stolen.
As the investigation deepens, a radical group called "The Obscurials" surfaces. Their leader, Lin Yao's most familiar and unfamiliar old friend, attempts to use "nothing" as a weapon to erase all human emotions and create an absolutely rational "perfect" world.
When the truth about his wife's death became intertwined with this huge conspiracy, Lin Yao was forced to face the deepest pain in his heart. In this steel jungle made of neon and rain, he not only wants to track down the murderer, but also the answer to the question: When everything can be stripped away, what finally defines us as human beings?
