WJSN got really popular in China due to the Chinity line going on produce 101 China and Cheng Xiao becoming a very popular actress in China. Their Chinese fandom are very loyal and always go ham when it comes to organising things like this.
I mean everyone knows Loona has the largest fandom when it comes to countries that use Spotify and yet WJSN’s Chinese fandom managed to secure them second on the UL Spotify streams even though Spotify is banned in China and they only had a few days to get all the accounts ready.