There's an Korean app called DuckAd that fans vote on to so that their biases get some promotion (ads). They are running a contest where the GP999 trainee with the most votes (needs to reach at least 3 million) will get a digital subway billboard promoting them for an entire month.
This app is mainly used by Koreans because it's all in Korean language and ifans can barely use it because of that. Korean votes count 50% in the final decision for the group. And the fact that Kim Chaehyun is #1 among mostly Koreans in this ad contest, even beating ex-CLC Yujin and Huening Kai's sister means her Korean support is HUGE.