Name: Ahn In-hye Stage Name: Aine Age: 26 Birthday: September 9 Gender: Female Height: 158cm Position: Main Vocalist, Elegant, Cheerful Characteristics: She has a gentle and warm personality. She possesses a chic, intellectual appearance and a soft, soothing voice. She is incredibly cool and professional when focused on her work.

Name/Stage Name: Jingburger Age: 25 Birthday: October 8 Gender: Female Height: 161.9cm Position: Sub-vocalist, Sexy, Cheerful Characteristics: She is a good drinker. She loves hamburgers. Being from Ulsan, her speech is mixed with a dialect. Although she has corrected it to some extent, she uses slightly more dialect than Lilpa. While she has a sexy side, she is very shy and usually keeps that side of herself hidden.

Name: Lee Hyo-in Stage Name: Lilpa Age: 24 Birthday: March 9 Gender: Female Height: 164cm Position: Main Vocalist, Rapper, Main Dancer, Sexy, Cute Hobby: Home baking Characteristics: The third eldest of ISD and the group's main vocalist, rapper, and dancer. She is popular for her powerful dancing, rapping, and refreshing high notes. She contributes many of her own ideas when choreographing. Usually, she is a lively prankster and, along with Gosegu, is one of the two most chaotic members. When scolded, she becomes completely dejected like a puppy, earning her the nickname 'Liltriever' (Lilpa + Retriever). Being from Busan, her speech is mixed with a dialect. She has mostly corrected it to Seoul standard speech, so the dialect is barely noticeable, appearing only slightly in her intonation.

Name/Stage Name: Jururu Age: 23 Birthday: June 10 Gender: Female Height: 162.3cm Position: Sub-vocalist, Lead Dancer, Variety Specialist, Sexy, Cute Characteristics: She is so princess-like that she earned the nickname 'Princess.' She is also skilled at enchanting or seducing people like a fox, leading Jingburger to call her a 'sly fox.'

Name/Stage Name: Gosegu Age: 22 Birthday: July 27 Gender: Female Position: Sub-vocalist, Variety Specialist Characteristics: Along with Lilpa, she is a very mischievous, chaotic, and loud person. She has excellent planning skills and great drive, making her quick to execute ideas. She provides entertainment with her unique sense of humor and gift of gab.

Name: Jang Viichan Stage Name: Viichan Age: 20 Birthday: January 16 Gender: Female Height: 161cm Position: Lead Vocalist, Cute Characteristics: She likes poke bowls. She dislikes strawberries—specifically, she likes fresh strawberries but hates artificial strawberry flavoring. She dislikes beans. Although she insists she is 'sexy,' she is actually just cute. Her nickname is 'Chan,' short for Viichan.