With Bae Juhyun's current spoken Chinese, forget about just gaining fans, coming to develop in China might not even be a problem.
Liu Xin'an had seriously considered bringing Bae Juhyun to China; there are opportunities, but the issue is there isn't a stage suitable for Bae Juhyun to showcase her charm.
Dance?
The key to girl group dances has always been the group. Bae Juhyun has the capital to develop in China, but Red Velvet doesn't necessarily, as not every member works as hard as Bae Juhyun does in learning Chinese.
Singing?
Bae Juhyun does have singing skills, but even then, she might just blend in with the idol artists, and if she were to step into the singer's circle, she'd get a good beating.
Acting?
...That's even more unrealistic.
That's the awkward part, can't just have Bae Juhyun join various variety shows, right?
Let's not even mention someone else; Bae Juhyun herself probably wouldn't be willing.
These are issues that need to be resolved step by step~