Six Bomb will debut without Subin, who was reported as Yoona’s best friend. Six Bomb was asked why they were called Six Bomb when there is only 5 of them. The members of Six Bomb replied, “Our team was originally named ‘Six Bomb’ to create a bomb in the industry with our six individual charms. However, member Subin recently fell down the stairs and injured her leg, and wasn’t able to join the final team.”

That is rather unfortunate, and I feel really bad for Subin. It is unknown whether Subin will join their future activities.The members of Six Bomb said, “Whether Subin will be joining us in the future when she recovers from her injury is up to the agency so we don’t know any details regarding that. Regardless, we hope wish her a speedy recovery.” Hopefully Subin will heal soon and be able to join the group later on or get another chance to debut. Six Bomb will make a debut on January 27th with `Chicky Chicky Bomb’.

Source