On January 11, Girl's Day's management label Dream T Entertainment issued an official statement regarding member Sojin's contract expiration. 

Read the label's statement below:

"Sojin's contract with Dream T Entertainment comes to an end in February of 2019, and we have decided not to renew the contract. The remaining members' (Yura, Minah, Hyeri) contracts are set to expire this year as well, so we are currently discussing various possibilities at the company. 

The Girl's Day members have no intentions of a disbandment. We are currently looking for ways to continue the group's promotions after this time frame.

We ask that you all send your abundant cheers so that each of the members can promote actively in even more manners. Thank you."

Per Dream T Entertainment's words, it seems that while Sojin will seek a new management company. Nonetheless, Girl's Day have not disbanded, and will seek ways to promote as a group in the future.