OMG Mystic Story just teased their girl group!

Omfg i have been waiting so long for their debut! Super excited

There are people saying that the 6th member isn't Suyeon but a japanese trainee that was also rumoured to debut, and I do think the same.

Suyeon entered the company just on March this year so I highly doubt she was planned to debut on this gg. She may be added later if they see she has a powerful fandom, but I doubt it.