The method was unorthodox to say the least.
When the lineup of ILLIT was first announced during the RU NEXT? finalé, the group had six members.

However, before the group officially debuted, member Youngseo was suddenly announced to have terminated her contract. Since then, there were no updates from the idol, until recently.
Youngseo was spotted filming something in late May, sparking rumors of a re-debut.
It was not clear what the idol was filming for, but recently, eagle-eyed netizens have seemingly discovered proof of her upcoming activities!
On June 5, Youngseo opened her own personal Instagram account.
While this is enough to come to the conclusion that she will be making her debut soon, netizens took things a step further, digging into her new account.
Looking into the information of her account, well-meaning fans have pointed out that the account seems to be connected to a domain, believed to be belonging to The Black Label.
The place in Youngseo’s recently revealed photos is Hannam-dong and TBL’s new company building is here. Youngseo opened an instagram account today and the domain name on her Instagram account is connected to TBL. pic.twitter.com/zUvNuvW1kv
— lydia (@smellymeovv) June 5, 2025
Additionally, the photo taken of then idol is believed to be near The Black Label’s building.
Many have reacted positively to this news, looking forward to Youngseo’s potential debut!
LEE YOUNGSEO has returned to THEBLACKLABEL and will debut in a New Girl Group they’re currently preparing 🖤
They’ll probably debut in 2025/2026.#YOUNGSEO #영서 #LEEYOUNGSEO#이영서 #AlwaysWithYoungseo pic.twitter.com/tlXGvEfvjS
— magical girl rune ✷ˎ-ˊ (@willibeit) June 5, 2025
tbl collecting all the it girls https://t.co/ZrvH5rIJqY
— yan (@youngzzeo) June 5, 2025
OH MY GOD!!!! IDOL YOUNGSEO IS COMING AAAAAAA https://t.co/FS9LdBwUBZ
— cat ₍^. .^₎^᪲᪲᪲⟆ (@amouryoungseo) June 5, 2025
There has been no official notice of Youngseo’s future activities.