Real Name: Choi Ji-woo Birth: September 7, 2006 (19 years old), Godeok-dong, Gangdong-gu, Seoul Nationality: Republic of Korea Physical: 168–169cm | Type A Family: Father, Mother, Older brother (born 2004), Pet dog Kong-i Agency: SM Entertainment Group: Hearts2Hearts Position: Leader, Dancer Character: Jju-jebi Debut: February 24, 2025, Hearts2Hearts MBTI: ISTJ Motto: Patience is bitter, but its fruit is sweet. Nicknames: My-Jju, Jju, The Girl with Short Hair, Short-hair Sunbae, Human Naevis, Fingers, Leader Choi, Cherry, Ju, White Weasel, Jju-jjon-ku, Girl Out of a Manhwa

Real Name: Nyoman Ayu Carmenita Birth: March 28, 2006 (20 years old), Bali Nationality: Indonesia Physical: 168cm | Type O Family: Grandfather, Father, Mother (born 1970), Older sister (born 2000), Older brother (born 2003), Younger brother (born 2007) Agency: SM Entertainment Group: Hearts2Hearts Position: Main Vocalist Character: Bing-ping Debut: February 24, 2025, Hearts2Hearts MBTI: ESFP Motto: You can't live life exactly as you want. Nicknames: Bali Girl, Rumen-ka, Rumen

Real Name: Yoo Ha-ram Birth: April 12, 2007 (19 years old), Bangok-dong, Wonju-si, Gangwon-do Nationality: Republic of Korea Physical: 164cm | Type B Family: Parents, Twin younger sister, Younger sister (born 2013) Agency: SM Entertainment Group: Hearts2Hearts Position: Vocalist, Dancer Character: Toramyi Debut: February 24, 2025, Hearts2Hearts MBTI: INTJ Motto: This too shall pass. Nicknames: First Love Girl, Baby Bunny, Toram-i, Intro Goddess, Vocal Fairy, Hexagon All-rounder, 412-gon, Yu-ha-ha-ho-ho, Ha-mung-i, Baby Otter, Yu-hi, Tyrant, Bungeoppang Goddess

Real Name: Kim Da-hyun Birth: June 18, 2007 (19 years old), Ulsan Metropolitan City Origin: Vancouver, British Columbia Nationality: Republic of Korea, Canada (Dual citizenship) Physical: 167cm | Type O | Left-handed Family: Father, Mother, Older brother (born 2002) Agency: SM Entertainment Group: Hearts2Hearts Position: Vocalist Character: Stell-nyang Debut: February 24, 2025, Hearts2Hearts 1st Single: The Chase MBTI: ENTP Motto: Stay true to yourself Nicknames: Pink Princess, Pink Girl, Tteokbokki, Baby Apricot, Gorgeous Sassy Girl, Tel-nyang, Stell-nyang, To-nyang, Prickly, Nutella, S-tto-ppi

Real Name: Kim Ju-eun Birth: December 3, 2008 (17 years old), Goyang-si, Gyeonggi-do Origin: Icheon-si, Gyeonggi-do Nationality: Republic of Korea Physical: 166cm | Type A | 245mm Family: Father, Mother, Older brother (born 2006), Pet dog Haneul (Toy Poodle) Agency: SM Entertainment Group: Hearts2Hearts Position: Main Dancer, Rapper Character: Jju-ilien Debut: February 24, 2025, Hearts2Hearts MBTI: ISFP Motto: Effort does not betray you! Nicknames: 2109, Jam-kuromi, Jueun Oppa, Ju-se-eun

Real Name: Noh Yu-na Birth: December 20, 2008 (17 years old), Seoul Origin: Giheung-gu, Yongin-si, Gyeonggi-do Nationality: Republic of Korea Physical: 170–171cm | Type A Family: Father, Mother (born 1983), Older sister (born 2005) Pet Dog: Aegie (Maltipoo) Agency: SM Entertainment Group: Hearts2Hearts Position: Rapper Character: Noh-sung-i Debut: February 24, 2025, Hearts2Hearts MBTI: ESFP Motto: Let's not leave regrets for past choices. Nicknames: Noh-sung-i, Lee Hoon, Serisa

Real Name: Jung I-an Birth: October 9, 2009 (16 years old), Hyehwa-dong, Jongno-gu, Seoul Nationality: Republic of Korea Physical: 164–165cm | Type B Family: Father, Mother, Pet cat Aru (born 2016) Agency: SM Entertainment Group: Hearts2Hearts Position: Center, Dancer Character: Jung Peanut Debut: February 24, 2025, Hearts2Hearts MBTI: ENTP Motto: Live life doing everything you want to do, don't do things you'll regret, blessings come to those who smile. Nicknames: Jung Peanut, Jung-pamine, Dwae-ing-i, The Girl in the Blue Knit, Eung-an-ian, Duba-ian

Real Name: Kim Na-yeon Birth: April 19, 2010 (16 years old), Sangbuk-myeon, Yangsan-si, Gyeongsangnam-do Nationality: Republic of Korea Physical: 166cm | Type A Family: Father, Mother, Pet cat Rio Agency: SM Entertainment Group: Hearts2Hearts Position: Vocalist Character: Alssong-haemssong Debut: February 24, 2025, Hearts2Hearts MBTI: ISTJ Motto: Well begun is half done. Nicknames: Ye-song-i, Kim Ye-on, Ae-haem-i, Diamond Maknae, Giant Baby, Boss Baby, Cute Maknae, Maknae on Top, All-rounder Maknae, Mandu FM Maknae, Nayeon-i-yeon, Ye-oni

A fox (sly/manipulative person). All the members dislike her. Real Name: Ryu Se-ah Birth: September 17, 2010 (15 years old), Seoul Nationality: Republic of Korea Physical: 167cm | Type B Family: Father, Mother, Pet cat Luna Agency: SM Entertainment Group: Hearts2Hearts Position: Vocalist Character: Ssea-mong Debut: February 24, 2025, Hearts2Hearts MBTI: INTJ Motto: None Nicknames: None