Meng Xin explained:

Meng Xin (English: newbie) generally refers to a new person who has just entered a certain field without a glimpse. Due to lack of experience, such people's questions and comments in this regard are very cute to those who know this, so they are named Meng Xin.

Extension:

As the name implies, it refers to all kinds of beginners with little knowledge in online games. Because he often makes mistakes or asks childish questions, he is suspected of selling Meng maliciously, so he is called a novice who sells Meng for a living.

Newcomers are mostly novice players who have not been exposed to some games, mainly young/old players. Compared with old players, young players generally don't like looking for information or playing by themselves. They prefer to find someone to solve their mistakes or reach out to body double.