Yes! New girl group Sistar has signed their album and gave it to Shindong as a gift!
I guess it should be during his radio program, Shimshimtapa. Sistar addresses shindong as a 'senior' because its written on the album, ' to: shindong sun-bae nim'.

They also added a small message at the side of their album, which ends with 'push push and minah(bonamana) daebak(the best)!'. It seems like they are a bunch of cheerful and polite girls, just by looking at their cheeky drawings on the album.

Sistar has debuted a week ago and has received many love for their new song, Push Push.

Reported by Ting18♥@dailykpopnews
Source: shindong's twitter.