TS Entertainment
On September 23, 2019, it was announced that Sumin and Nahyun of Sonamoo were filing a lawsuit against TS Entertainment to terminate their contracts after the company failed to end their contracts following the two sending TS Entertainment certifications of content back in May. TS Entertainment released a statement on the same day, claiming that the two members suddenly "cut contact" with the company and group after the documents were sent. The statement also announced Sonamoo would continue as a five member group.