Lin Mo's peaceful life in exile was broken by a bizarre commission: a mysterious client in the upper city asked him to prepare a liquid that could awaken "specific sadness" at a high price. During the preparation process, Lin Mo accidentally discovered that the formula was highly related to the "accident" in which he was exiled. In order to explore the truth, he was forced to cooperate with the "Awakened Ones", sneak into the forbidden area, and fight against the pursuit of the Order Officer. He gradually discovers that emotional hormones are not only a control tool, but also the core of a huge conspiracy - the "chief engineer" is trying to use the emotional energy of the entire city's residents to conduct a crazy experiment that can subvert the definition of human beings. Lin Mo must choose between assimilation or rebellion, and his choice will determine the fate of everyone in Arcadia.
