Is Sejeong now the most successful post-IOI member?

They both the most successful in their own field. One as a singer, one as an actress

Quote from itiswhatitisss

Wasn't she blacklisted and eaten alive by Cnetz after one of the biggest actresses in China came for her? I have no idea how she's doing cause this is all I know, but I won't doubt her popularity.

Noooo. She did receive some backlash but the drama aired peacefully and she gained more popularity after that. Zhao Liying also didn’t directly mention her, she was mainly shading the writers who were changing the script and cutting her scenes.

in music area yes it is chungha

But for overall career i would say sejeong who is more success and known by gp korean