HaSeul (Hangul: 하슬)[2] is the third revealed member of LOONA and a member of its first sub-unit, LOONA 1/3.

She was born as Cho Ha-Seul[3] (Hangul: 조하슬) on August 18, 1997, in Suncheon, South Jeolla Province, South Korea.[4]

She debuted on December 8, 2016 as a member and subsequently released her solo single album HaSeul on December 15, 2016.


Early life (1997–2016)

HaSeul was born in Suncheon, South Korea, on August 18, 1997. She is the oldest of two siblings, with one younger brother born in 2002.[5]

In elementary school, HaSeul participated in her school choir, which ignited her love of singing.[5] As a student, HaSeul studied abroad in Sydney, Australia for a month.[6] In high school, she moved to Colorado, USA, and studied for another year. Upon returning to Korea, HaSeul had to stay an extra year in high school due to her time overseas.[7] HaSeul planned to continue with her studies and go to college to study opera.[5]

This plan changed after she was cast by BlockBerryCreative after participating in a singing contest at the recommendation of her music teacher. She passed her audition and became a trainee at the same time as YeoJin and Choerry, in late 2015 or early 2016. She and Choerry lived near each other and would commute to BlockBerry headquarters together.

2016: Reveal, Debut in LOONA

HaSeul trained under BlockBerryCreative for one year before being selected as the third member of LOONA. This came after months of worry for HaSeul, who believed she would never debut when surrounded by so many other talented trainees.[8] HaSeul had no known previous training in dance, and made mistakes during her choreography performance on selection day.[9] However, she was still chosen as the third member of LOONA, which HaSeul couldn’t believe was real, even when traveling to shoot her music video.

On December 8, 2016, the second “Who’s Next Girl?” teaser was released, and HaSeul was revealed as the third member of LOONA that same day. She released her solo single album HaSeul on December 15, 2016, and subsequently debuted as a member of LOONA.

2017: MIXNINE, LOONA 1/3, “Everyday I Love You”

In October 2017, HaSeul, along with fellow LOONA members HeeJin and HyunJin, auditioned for the survival reality show MIXNINE. Sadly, only HeeJin and HyunJin passed the audition.[10]

She was revealed to be a member of LOONA’s first sub-unit, LOONA 1/3, on February 14, 2017.

HaSeul was featured on ViVi’sEveryday I Love You”, where she covered the rap part of the song.

2018: Debut in LOONA

On August 20, HaSeul officially debuted as the leader of the completed group LOONA. She and her members released their mini-album [+ +], along with title track “Hi High”. Although HaSeul had been a lead vocalist of LOONA 1/3, she did not receive many lines or singing time on [+ +].

2019: First comeback, first hiatus

On February 19, 2019, LOONA released [X X], a repackage album of [+ +] featuring new title track “Butterfly”. On February 25, BlockBerryCreative reported that HaSeul’s grandmother had passed away, and that HaSeul would take personal time to grieve.[11] After promotions for [X X] came to an end, BlockBerryCreative officially announced a longer hiatus for HaSeul,[12] which lasted from May 10 to July 9.[13]

2020: Second hiatus

On January 7, 2020, BlockBerryCreative announced that HaSeul would be sitting out promotions of the upcoming album [#] due to mental health concerns.[14] She was said to be diagnosed with “intermittent anxiety symptoms” and would be taking time to focus on her health. Although HaSeul did not contribute to title track “So What” from [#], her voice can still be heard on three of the songs on the album, including lead single “365”.

After LOONA’s first ever music show win on March 12, 2020, HaSeul posted on social media for the first time that year, expressing her thanks to fans.

HaSeul also extended her hiatus to LOONA's third comeback 12:00 until she felt her recovery was better enough for promotions.[15][16]

On December 29, 2020 a video teaser titled "New Moon" was revealed. All the following members were shown, along with a clip of HaSeul in the teaser, as a hint for her return.

2021: Return to LOONA, &

In March 2021, she has been mentioned by her roommate YeoJin that she has moved back to the dorm.

On June 2, 2021, LOONA released the second photo teaser for [&], their fourth mini-album. The teasers featured the eyes of all twelve members, signaling her comeback after a year and a half of being on hiatus. It was later confirmed after a Naver article about her return was reposted on LOONA's Twitter account. Two days later, her individual teaser for [&] was released, with hers being the first to be revealed.

On August 21, 2021, HaSeul made her return on LOONA TV on LOONA TV #745.


Single albums



TV Appearances

Year Name Channel Role
2017 MIXNINE jTBC Herself (Contestant)

Web Drama

Year Name Channel/Platform Role
2017 Do You Remember the First Time We Met? Season 1 YouTube Cho HaSeul (Main)
Do You Remember the First Time We Met? Season 2
2018 Do You Remember the First Time We Met? Season 3 Cho HaSeul (Minor)

Music Video Appearances

As Cameo

Year Name Artist
2018 Heart Attack Chuu

As Minor

Year Name Artist
2017 Love Cherry Motion Choerry

As Rapper

Year Name Artist
2017 Everyday I Love You (feat. HaSeul) ViVi


  1. Master - LOONA 20180928: “No specific species. Just a white bird.”
  2. /haˈ.sʰɯɭ/, HAH-suul
  3. LOONA TV 307
  4. MyDaily LOONA 1/3 Interview 2017.04.01
  5. 5.0 5.1 5.2 loonatheworld “LOONA TV #170” YouTube. 2017.08.10
  6. @tracetheworld.180901 fansign account. Twitter. 2018.09.01
  7. LOOΠΔ GIRLS (@loonagirls) “180908 Mokdong fansign fanaccounts” 2018.09.08
  8. loona-trans “My music teacher paved my path to becoming a singer.” (Orig) Tumblr. 2017.03.12
  9. loonatheworld “LOONA TV #40” YouTube. 2016.12.16
  10. MIXNINE Episode #1. 2017.10.29
  11. cΔsker (@caskerbox) “Haseul’s grandmother passed away last night.” Twitter. 2018.02.25
  12. Orrery/nim (@orrery_nim) “Haseul will not be attending LOONA events in the immediate future for personal reasons.” Twitter. 2019.05.10
  13. loonatheworld. “Orbits! It's #HaSeul here!” Instagram. 2019.07.09
  14. Orrery/nim (@orrery_nim) “From the fancafe” Twitter. 2020.01.07
  15. Soompi:LOONA’s Haseul To Remain On Hiatus During “12:00” Comeback
  16. Daum Cafe:공지사항 게시판 권한 안내