What does it mean to use a 'back household' for second-hand cars?

[SanGavin]

The 'back household' phenomenon is a hidden danger in the second-hand car circulation market. The so-called 'back household' refers to locals whose profession is selling their ID cards to non-locals for use. A second-hand car back door refers to purchasing a second-hand car using someone else's ID card, where the ID card holder is called the back household. Generally, back household cars cannot be transferred. The difference between a back household car and a mortgage car is that a back household car is a normal car with complete procedures and regular annual insurance, but it cannot be transferred. This behavior is illegal. At the same time, purchasing a second-hand car with a backup is very risky and is not recommended. The 'agreement' signed between the 'back household' and the buyer violates the law. Usually, back household cars are only privately agreed upon between the buyer and seller, and the car remains under the original owner's name. The person who sells you the car is likely not the original owner, so such agreements have no legal effect.