Gu Chang'an, the accountant of Fuyun Sect, is skilled in deducing the profit and loss of heaven and earth arts. When the sect selects advancement qualifications, he finds that the list quota is abnormal, and also discovers that heaven and earth owe the human world three hundred years of vitality. Su Jianwei, the young pavilion master of the Tianji Pavilion, brings a shocking secret: the world has been reset six times, and tomorrow everyone will forget Gu Chang'an. The little accountant, who has no desire for strife and only wants to live in peace, holds an abacus and investigates all the way, uncovering the hidden dossiers rewritten repeatedly behind the advancement destiny.