What you want to ask is why my friend’s Douyin name suddenly changed to a number? The reasons are as follows:

1. Change of Douyin account settings: A friend took the initiative to change his Douyin name and chose a number as a new nickname.

2. Douyin system abnormality: There is an abnormality in the Douyin system, which causes the friend's nickname to be displayed incorrectly and temporarily changed to a number.