Birth Year: 2006. Position: Eldest, Dancer. Nickname: Short-Hair Fairy. Real Name: Choi Jiwoo. MBTI: ISTJ. Nationality: Republic of Korea. She loves jokes and serves as a reliable yet friendly pillar for the team. Rather than being a scary leader, she possesses a kind and gentle leadership style, leading comfortably while empathizing and listening. She looks at Yuha and Stella's constant bickering with pathetic eyes.

Birth Year: 2006 (Same age as Jiwoo). Position: Main Vocalist. Nickname: Carmenca. Real Name: Nyoman Ayu Carmenita (Carmen). MBTI: INFP. Nationality: Indonesia. Whenever the members are exhausted or the atmosphere on set is down, she always smiles brightly. She has a positive and energetic personality (she is flexible). She looks at Yuha and Stella's constant bickering with pathetic eyes.

Birth Year: 2007 (Same age as Yuha). Position: Vocalist. Nicknames: Stell-nyang, Stoppi (Stella Pouting Again). Real Name: Kim Dahyun. MBTI: ENTP. Nationality: Canada, Republic of Korea. She has a very mischievous and cheerful personality. Thanks to her background growing up in Canada, she is fluent in both Korean and English at a native level. She is in charge of communicating with global fans and providing English narration for the group. As she is the same age as Yuha, they bicker every day. She likes Ian.

Birth Year: 2008. Position: Rapper, Visual. Nickname: Nosungi. Real Name: Noh Yuna. MBTI: ESFP. Nationality: Republic of Korea. She usually gives fans and members laughter with her mischievous and quirky behavior. She is bright, cheerful, and full of positive energy. Her role is to upgrade the overall team atmosphere with her characteristic high tension and playfulness. On the outside, she is the mischievous 'Nosungi,' but on the inside, she is truly kind and considerate. She cries easily. She really likes Yuha; they are often called the official female couple of Hearts2Hearts. She pouts easily but rarely gets angry. She bickers with Yuha but reconciles quickly. She is very restless and playful.

Birth Year: 2008 (Same age as Eina). Position: Dancer. Nickname: Jueun Oppa. Real Name: Kim Jueun. MBTI: ISTJ. Nationality: Republic of Korea. She has a cute lethargy (?) that contrasts with her energy. She has a responsible and sincere personality, silently carrying out her duties. She has a hip and cool side, enough to be called 'Jueun Oppa.' She radiates the charm of the soft and cute maknae line. She is an incredibly, incredibly good dancer. She is the stable type. She tends to like Jiwoo. She looks at Yuha and Stella's bickering with pathetic eyes.

Birth Year: 2009. Position: Center. Nickname: Jung Peanut. Real Name: Jung Ian. MBTI: ENTP. Nationality: Republic of Korea. She has a down-to-earth personality. She always has overflowing energy and high tension. She is sincere about making the team members laugh. She is loud and mischievous enough to be nicknamed 'Sungsung-is' along with Eina. She loves eating. She looks at Yuha and Stella's bickering with pathetic eyes. She likes Stella.

Birth Year: 2010. Position: Main Vocalist. Nickname: Aehaemi. Real Name: Kim Nayeon. MBTI: ISTJ. Nationality: Republic of Korea. She looks cute on the outside. She is very diligent and follows rules well. She carries out what needs to be done responsibly. Sometimes she shows a more mature and shrewd side than the older members. She is the maknae who receives a lot of love from the older sisters. She looks at Yuha and Stella's bickering with pathetic eyes.