"Serendipity~ In Stars! Hello, we're your S.I.S"
Their name stands for "Serendipity In Stars".
2018: Fandom name
On December 31, as a form of a New Year's present, S.I.S announced their official fandom name to be MILY (밀리).
2019: Dal's solo debut, "Always Be Your Girl" & new line-up
On July 12, XX Entertainment reported that the contract with member J-Sun had expired and she had decided not to renew it, preferring to focus on her studies. In addition, member Dal will enter in a temporary hiatus for personal reasons. The group will therefore promote with 4 members.
|Minzy (민지)||Main Rapper, Dancer|
|Anne (앤)||Vocalist, Dancer|
|Sebin (세빈)||Vocalist, Maknae|
|Dal (달)||Main Vocalist|
|J-Sun (지해)||Leader, Vocalist|