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CompanyMBK Entertainment
Year Debut2019
Year Active1
Year Disbanded2020

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1THE9 (원더나인; pronounced Wonder ‘Nine’) is a South Korean boy group formed by MBK Entertainment through the 2018 idol survival show Under Nineteen. The group debuted on April 13, 2019. The nine members of 1THE9 are Doyum, Taewoo, Jinsung, Yechan, Yongha, Taekhyeon, Sungwon, Seunghwan, and Junseo.

Under Nineteen was an idol survival show where the participants, all under 19 years old (born in 1998 or after), competed for a position in the final lineup of the K-pop group. The final nine members of 1THE9 were chosen via audience voting during the survival show Under Nineteen.


1THE9 is a temporary group, not a permanent group. Their contract is only for 17 months, which includes 5 months of training and 12 months of promotion, after which the individual members will return to their respective agencies. On July 16, 2020, their M/V for Bad Guy was released, which was 1THE9’s last comeback before officially disbanding on August 8, 2020

1THE9 Member Ages

1THE9 Age Ranking

Ranked from oldest to youngest.

1. YonghaJan 11, 199924 years old
2. LouisApr 23, 199924 years old
3. SeunghwanMay 20, 200023 years old
4. YechanMay 14, 200122 years old
5. JunseoNov 20, 200122 years old
6. DYFeb 21, 200221 years old
7. JinsungMar 30, 200221 years old
8. TaekhyeonJul 28, 200320 years old
9. WonDec 18, 200319 years old

1THE9 Member Heights

1THE9 Height Ranking

Ranked from tallest to shortest.

1. Yechan1.83 m (6'0")
2. Won1.79 m (5'10")
3. Taekhyeon1.78 m (5'10")
4. Junseo1.78 m (5'10")
5. Seunghwan1.78 m (5'10")
6. Yongha1.77 m (5'10")
7. Jinsung1.76 m (5'9")
8. DY1.75 m (5'9")
9. Louis1.74 m (5'9")


1. Yongha: leader, lead rapper, vocalist

2. Taewoo: vocalist, rapper

3. Seunghwan: lead dancer, lead vocalist

4. Yechan: main vocalist, lead dancer

5. Junseo: lead vocalist, lead dancer, rapper, visual

6. Doyum: main dancer, lead rapper, vocalist

7. Jinsung: main dancer, lead vocalist, visual

8. Taekhyeon: main rapper, vocalist

9. Sungwon: main rapper, vocalist, maknae

Under Nineteen Final Ranking

1. Doyum

2. Jinsung

3. Taewoo

4. Yechan

5. Taekhyeon

6. Seunghwan

7. Yongha

8. Sungwon

9. Junseo

Fun Facts and Trivia

  • The leader and oldest member of 1THE9 is Yoo Yongha (born Jan 11, 1999).
  • The youngest member (maknae) of 1THE9 is Park Sungwon (born Dec 18, 2003).
  • The tallest member of 1THE9 is Shin Yechan with a height of 183 cm (6'0'').
  • The shortest member of 1THE9 is Kim Taewoo with a height of 174 cm (5'9'').


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