"Serendipity~ In Stars! Hello, we're your S.I.S"
S.I.S (에스아이에스) was a four-member girl group under XX Entertainment. They debuted on August 25, 2017 with the single album "I've Got A Feeling". They unofficially disbanded sometime around March 2021 without any announcements.Their name stood for "Serendipity In Stars".