Retired accountant Zhou Lan, faced with the greed of her daughter and son-in-law to calculate her pension money for house exchange, pretended to show weakness but accidentally received a bank card stolen from her son-in-law. When checking the balance, she discovered that it was a credit card with a negative balance of 5 million. Zhou Lan instantly saw through the frame-up trap set by her son-in-law Fang Yuan - Fang Yuan forged his qualifications to fraudulently borrow 5 million and lost all of it in gambling, in an attempt to push the huge debt onto her. As an old accountant, Zhou Lan calmly collected evidence and set up a counterattack step by step. Not only did he expose his daughter and son-in-law's scam in public, but he also cooperated with the police to bring the two suspected of financial fraud to justice.
