Unfortunately, they debuted at a time with an influx of girl group debuts, and Shinsadong Tiger got swept into plagiarism controversies, leading to a lackluster debut. The new company and Shinsadong Tiger eventually decided to part ways, leaving the group in a 3:3 split:
Yooji, Haeryung, and Dami under the new company, since they were contracted under the new company,
The Pann article says that it was a 3:3 split: when Shinsadong parted ways with AB Entertainment, Yuji Haeryung and Dami who were signed with AB left, while the others were signed with Shinsadong and stayed in the group.
Bestie aren't bad girls
Yeah, so I hope people will stop calling Bestie traitors