In the letter she says,
"Hello, this is Soyoung.
I would like to greet the fans who never forgot me and continued to support and wait for me and tell you guys some exciting news. After a lot of thought, I've decided to put my trust in and sign an exclusive contract with a new agency, WK ENM. Thanks to all of you who continued to support me, I'm able to dream of debuting as a soloist. Although I am still lacking in many ways, I'm excited to tackle a new challenge and phase of my career. Thank you to the WK executives and employees for helping me stand on stage once again, and thank you again to my fans. I hope you can give us lots of interest and support."
WK ENM has also made a statement concerning Soyoung stating,
"We have signed an exclusive contract with Soyoung. We will provide our full support for a fast solo debut."
Soyoung was a late addition to Stellar, who were active from 2011 to 2018. Soyoung joined in 2017 and only participated in the "Archangels of Sephiroth" promotions.