In the 10th year of the apocalypse, "water, food, and medicine" are no longer the scarcest resources - humans have experienced "life span decay" after nuclear pollution, and the average life span is only 30 years old. A "life countdown" will automatically appear on everyone's wrist. The only way to extend life is to "store kindness" in the "time bank": helping others repair a radio can give you 2 hours of life; saving a child who is about to starve to death can give you 3 hours. Life span; if you do something bad, your life span will be forcibly deducted. The protagonist Lin Ye is the "teller" of the last time bank. Her job is to record everyone's "goodwill value", but she discovers that someone is secretly forging "goodwill records" and using lies to steal other people's lifespans.
