August 21, 2012 03:08 AM EDT
Bada uploaded on a photo on her Twitter on Sunday saying "Stop looking my sister Hyorin. SISTAR knows what's up. I like my sisters who are talented."
In the uploaded photo, there is the signed CD that SISTAR gave to Bada. Their hand written letters especially grabs the attention.
Hyorin said "Unni(Older sister), I'm your pretty little sister Hyorin. Thank you for always taking care of me. I'll do better. Thank you for singing with your beautiful voice. I'll be a singer like you. I love you," showing off her close relationships wit'h Bada.
Her handwriting is very cute, showing different side then her tom-boy personality.
Internet users responded "Hyorin's handwriting is so cute," and "I didn't know she was close with Bada."
On the other hand, SISTAR is continuing thier activities with summer special album Loving You.