With only 47.5 yuan left in his pocket, he takes a 23-hour ride on a slow green train to collect a debt. Everyone laughs at him for being crazy. Until he uses a calculator to outsmart loan-sharking thugs, bankrupt a business partner who ran off with his money, build a business with five branches, and win back a wife and child. Some say money is all-powerful and everything can be measured in numbers. But I know that while accounts can be settled, love cannot be calculated. I'll spend a lifetime working it out, little by little.