- On May 23, 2017 it was announced the group was to disband following their final release on May 31st. The group officially disbanded on June 4, 2017, with their final performance being on Show Champion on June 7. [June 2017].
- Their group name is a combination of the words "Sister" and "Star", meaning they are meant to be sisters in the entertainment business and become big stars.
- Their official fanclub name was "Star1" (Pronounced Style), and the official fanclub color was pearl fuschia.
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