This is not illegal. Idle fish is a regular second-hand platform, and books purchased from outside the network are guaranteed by the platform. The quality guarantee is fake, and it is a genuine platform for buying books. Therefore, it is not illegal for idle fish to buy books online. Idle fish is a community-based second-hand idle trading market, which not only supports all kinds of secured transactions in the same city and online, but also is safer. At the same time, there are also the most professional second-hand merchants, who can easily buy and sell second-hand idle.