It looks that way! The teaser below was released on Woollim’s official twitter account. Lovelyz is gearing up for their new comeback and it looks like Seo Ji-soo will be joining them this time around. The new album is entitled, Lovelyz8, and I’m thinking that may be the only hint we get right now.
Seo Ji-soo was not part of the original debut of Lovelyz due to legal issues and since then she remained out of the public eye. I’m sure they haven’t replaced her so we shall see how they re-introduce her as a member of Lovelyz.