Guoguo is three years and four months old, and I have raised her for over three years. Once, short on cash for an autumn field trip, I asked my daughter-in-law for money for the very first time, and she assumed that my monthly financial requests meant I still felt it wasn't enough. Until I unexpectedly learned that she transfers large sums of money to her son every month, accumulating one million over forty months, while I never saw a single penny. From harboring complaints to teaming up to reconcile their accounts, the secret my own son kept for three years is finally uncovered by this field trip fee.