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CompanyN.CH Entertainment
Year Debut2020
Year Active3
Year DisbandedN/A

Not Ranked



TO1 (Korean: 티오오; acronym for "TOgether as ONE") is a 9-member South Korean boy group under CJ ENM formed through Mnet’s 2019 survival show, World Klass. The group debuted on April 1, 2020, with 10 members. There were several lineup changes after their debut. The current members of TO1 are Donggeon, Chan, Jisu, Jaeyun, J.You, Kyoungho, Daigo, Renta, and Yeojeong.

TO1 was formerly known as TOO (Ten Oriented Orchestra). 

TO1 Member Ages

TO1 Age Ranking

Ranked from oldest to youngest.

1. DonggeonJul 15, 199924 years old
2. ChanDec 08, 199923 years old
3. JisuJan 19, 200023 years old
4. JaeyunAug 16, 200023 years old
5. J.YouNov 02, 200023 years old
6. KyunghoMay 07, 200122 years old
7. DaigoJan 21, 200221 years old
8. RentaFeb 16, 200320 years old
9. YeojeongJan 29, 200518 years old

TO1 Member Heights

TO1 Height Ranking

Ranked from tallest to shortest.

1. Kyungho1.83 m (6'0")
2. Yeojeong1.82 m (6'0")
3. Renta1.80 m (5'11")
4. Donggeon1.80 m (5'11")
5. Jisu1.77 m (5'10")
6. Chan1.77 m (5'10")
7. J.You1.74 m (5'9")
8. Daigo1.73 m (5'8")
9. Jaeyun1.72 m (5'8")


TO1 is composed of 9 members born between 1999 and 2002. The current members of TO1 are:

The original 10 members included: Donggeon, Chan, Jisu, Minsu, Jaeyun, J.You, Kyungho, Chihoon, Jerome, Woonggi. They were the winners of the reality show World Klass.

Former member Chihoon left the group on Apr 30, 2022. Minsu, Woongi, Jerome departed in June 2022. Daigo, Renta, and Yeojeong joined shortly after in July 2022.

The oldest member is Donggeon (born Jul 15, 1999). The youngest member (maknae) is Yeojeong (born Jan 29, 2005).


  • Donggeon: main vocalist
  • Chan: main dancer, rapper
  • Jisu: lead dancer, vocalist
  • Jaeyun: leader, main vocalist
  • J.You: rapper, visual
  • Kyungho: main dancer, vocalist
  • Daigo: vocalist, dancer
  • Renta: rapper, dancer
  • Yeojeong: vocalist, maknae

Fun Facts and Trivia

  • The leader of TO1 is Jaeyun.
  • The oldest member of TO1 is Donggeon (born Jul 15, 1999).
  • The youngest member (maknae) of TO1 is Yeojeong (born Jan 29, 2005).
  • The tallest member of TO1 is Jang Kyungho with a height of 183 cm (6'0'').
  • TO1 was formerly known as TOO (Ten Oriented Orchestra). The new name was announced on Mar 2021 following a dispute between the agencies managing the group.


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