When GFriend disbanded, after some time she changed description on IG from Sowon to Kim Sojeong, and later on she signed that deal with IOK Company. Later on she added 'Sowon' again after her real name and said it's because international fans know her under her stage name. Surprisingly tho after a year in august fans discovered she isn't listed as actor anymore on IOK website, and IOK confirmed through statement that their exclusive contract with Sowon has expired.
So now few days back Sowon deleted Kim Sojeong from her info, and left only her stage name - SOWON.
Gfriend fans are now saying that probably she had some announcement scheduled but it might be postponed due to Itaewon tragedy.
Honestly at this point it wouldn't be weird if she said she will debut solo, or if she will join Viviz.