Retired anti-fraud police officer Lao Zhou opened an inconspicuous anti-fraud studio in the community. His team is very special; his daughter Xiao Min is a bank teller guarding the last checkpoint of transfer; food delivery rider A Zhe is a mobile sentinel, using the convenience of food delivery to discover various types of anti-fraud clues. In the first case, they rescued the living-alone Grandma Chen from the hands of health supplement scammers. Grandma Chen put on a blue vest and became the first volunteer. Soon after, divorced single mother Sister Li fell deep into a pig-butchering scam and was stopped by Xiao Min at the very last moment before the transfer.