In this cyber city known as the "emotional black market", strong human emotions can be extracted and condensed into crystal clear "emotional crystals", which can become expensive luxury goods or contraband. Happiness is the currency, despair is the deadly poison. Lin Ke, the top "emotional hunter", sneaks into the darkest underground trading market in the city to save his sister who is dying due to the "crystal of despair", vowing to hunt for a ray of the legendary "absolute hope".
