Good Day 굿데이
  Good Day 굿데이 Group Info

  Tag Category: Good Day


  Active: 2 years 1 month

  Gender: Female

  of Members: 10

  C9 Ent.

  Subunit: Good Morning

  Subunit: Good Night

  Subunit: Midnight


  Good Day Group Stats Chart
Stage Name Birth Name Position Birthday Age Height Star Sign C Y BT
Heejin 희진 Song Heejin Leader, Vocal 24 162 cm or 5'4" Leo Pig B
Genie 지니 Kim Jiwon Visual 22 168 cm or 5'6" Capricorn Rat B
Cherry 체리 Kim Chaeyoung Dancer 22 Cancer Ox B
Chaesol 채솔 Moon Chaesol Sub-vocal 21 169 cm or 5'6½" Cancer Tiger A
Nayoon 나윤 Hwang Nayoon Vocal, Dancer 20 Aries Hare O
Jiwon 지원 Kim Jiwon Visual 20 164 cm or 5'4½" Aries Hare O
Haeun 하은 Kim Haeun Vocal 20 Libra Hare B
Viva 비바 Hwang Jiwon Dancer 19 166 cm or 5'5½" Aquarius Dragon A
Bomin 보민 Kim Bomin Sub-vocal 18 Libra Snake AB
Lucky 럭키 Jin Hyunjoo Dancer, Maknae 17 161 cm or 5'3½" Scorpio Snake A
  About Good Day 굿데이  

Good Day 굿데이 is a ten-member female idol group formed by C9 Entertainment. They debuted on August 30, 2017, with their 1st mini album All Day Good Day.


In 2012, Haeun was part Nega Network's 3-member girl group Littles, which never debuted.  The group's only release was an OST for the drama "The Great Seer."

In 2013, Heejin took third place on "Superstar K5."  Bomin acted in No Breathing in the role of a younger version of Yuri's character.

In 2015, Heejin released her debut single, "To Reach You," featuring the rapper Olltii. She also sang OSTs for the dramas "Late Night Restaurant" and "Into the Flames."

Jiwon has been a model for the teenage fashion online shopping portal Sonyunara since before debut.


In July 2017, C9 Entertainment announced the launch of their first female idol group, C9 Girls. On July 7, members Genie and Nayoon were revealed, alongside the group name: Good Day. On July 10, members Bomin, Jiwon, and Lucky were revealed. On July 11, members Cherry, Chaesol, and Viva were revealed. On July 12, members Heejin and Haeun were revealed. On July 15 and 16, the group revealed the members' clean version teaser photos and B-cut teaser photos respectively. From July 20 to August 10, on Thursdays, 4 episodes of their reality show, "Good Day 2 U," was shown on C9 Entertainment's V App channel.

On August 30, they debuted with their 1st mini-album, All Day Good Day, with the music video for their debut track "Rolly" featuring the appearance of C9 Entertainment trainee and current Wanna One member Bae Jinyoung. The other 3 tracks from the mini-album are songs from the group's 3 units: Good Morning, Good Night, and Midnight. On September 3, they held their debut mini-concert All Day Good Day at the Yes24 Live Hall.

Six members (Heejin, Genie, Chaesol, Jiwon, Viva, Lucky) joined the reality television series "The Unit." All except Lucky passed the Boot Evaluations in episode 1.[However, Lucky was revived from her elimination.

On November 1, it was announced that Nayoon will take a break from the group's activities due to a tear in her ligament during practice.


  • Nayoon, Jiwon, and Haeun were born in the Year of the Hare.
  • Bomin and Lucky were both born in the Year of the Snake.
  • Cherry and Chaesol’s star sign is Cancer.
  • Nayoon and Jiwon’s star sign is Aries.  They were born 2 days apart in 1999.
  • Haeun and Bomin are both Libras.
  • Heejin, Genie, Cherry, and Haeun’s blood type is B.
  • Chaesol, Viva, and Lucky’s blood type is A.
  • Nayoon and Jiwon’s blood type is O.
  • Cherry and Chaesol both have July birthdays.
  • Heejin and Nayoon are both from Seoul.