S.I.S (Hangul: 에스아이에스 "S.I.S.") is a South Korean girl group formed by Double X Entertainment in 2017. They debuted on August 25, 2017, with I've Got A Feeling.
In 2017 all members participated in KBS's "The Unit Idol Rebooting Project" however only Anne, Gaeul and Sebin passed the audition stage. Sebin was eliminated at rank 55, Gaeul was eliminated at rank 39 and Anne was eliminated at rank 22.
Later on, Anne was shown as a back-up performer in UNB's Black Heart and was seen in performances with them alongside DIA's Jueun, former Beatwin member Jungha and IM's Hangyul. Hangyul and Jungha had participated in The Unit alongside Anne.
On 13th July, Double X Entertainment revealed "S.I.S will be promoting as a 4-member group with Minji, Gaeul, Anne and Sebin from now on.". Double X added on, "our contract with member Jihye recently came to an end[...]"Dal, on the other hand, will be taking a hiatus from her promotions due to personal reason.