The renovation manager who oversaw the renovation of Yu Xifeng's mother's old house in Cokoya County. He informed Yu Xifeng about the bulletproof glass, the secure door lock that could not be pried open or easily copied, and the new heating system that made the house feel like summer even when it snows outside. Lin City is in the south where heating is rare. Manager Cao warned Yu Xifeng to keep the key safe.
