Ten years into the apocalypse, radioactive dust blankets the land, “gray lung disease” rages, mutated creatures occupy the ruins, and looters roam unchecked. Shen Yan, a former surgeon, ventures alone into the radiation zone to gather “blue calyx” and make medicine for An'an, his adopted daughter, who is terminally ill. Lin Ye, a homeless boy, struggles to survive among the ruins to protect his gravely ill younger sister, Lin Xi. One unexpected encounter and two vials of blue calyx medicine bind together two people each burdened with someone they cannot bear to lose. They travel together through the perilous ruins of Iron City, heading for the Oasis, a safe zone said to be able to cure gray lung disease. But the road ahead holds more than the fangs of mutated beasts and the blades of looters. It also hides secrets in their hearts: Shen Yan's past conceals a sin tied to the outbreak of the apocalypse, while Lin Ye's survival code masks a cruelty no one knows about. The feelings that grow in their desperate circumstances are like the stubborn blue calyx flourishing in the radiation zone: dangerously fraught, yet impossible to resist. They must choose between saving others and saving themselves, and navigate between trust and suspicion. In the end, amid the ashes, they will find a “field” and an “inkstone” of their own.
