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Wonder About Us! Hello we are 1THE9


1THE9 (원더나인) was a nine-member project boy group signed under MBK Entertainment and managed by PocketDol Studio. They were formed through the competition reality show Under Nineteen and officially debuted on April 13, 2019 with the mini album XIX.[1]

The group was under a 18-month contract (originally 17-month) and officially disbanded on August 8, 2020.[2][3]


Pre-debut: Under Nineteen[]

Under Nineteen, which began airing on November 3, 2018, concluded on February 9, 2019 where the final 9 members were chosen during the live finale broadcast. It was also revealed the group would be called 1THE9.[4]

2019: "Domino", Debut with XIX, Blah Blah[]

On February 26, the debut date was set to April 12, 2019 (later changed to the 13th). On the same day, the concept photos of the members was revealed.[5][6]

On April 5, the debut timeline started and the name of the album was revealed to be XIX with the title track being "Spotlight". A pre-debut title track, "Domino", which was written and produced by Under Nineteen's vocal trainer Crush, was released on April 7. The group then made their official debut on April 13 with the release of the mini album.

On April 17, they held their debut showcase through V Live, with their fandom and fandom color announced to be Wonderland and Lime Punch, respectively.[7]

On October 17, 2019, 1THE9 released their second mini album Blah Blah.

2020: Turn Over and Good Bye 1THE9[]

On July 6, the group announced they would be coming back with their third mini album, Turn Over, on July 16.[8]

On July 27, it was confirmed that the group would be disbanding on August 8. They were originally scheduled to disband on July 8 but due to their comeback being postponed due to the COVID-19 pandemic, it was extended by a month.[3]

On August 3, 1THE9 announced that they would be releasing their final mini album, Good Bye 1THE9, on the 5th. The album is a special gift to their fans prior to the group's disbandment.[9]



Rank Name Agency Position(s)
6 Yoo Yong Ha (유용하) OUI Entertainment Leader, Lead Rapper, Vocalist
3 Kim Tae Woo (김태우) A team Entertainment Lead Vocalist, Rapper
8 Lee Seung Hwan (이승환) Play M Entertainment Main Dancer, Lead Vocalist
4 Shin Ye Chan (신예찬) TOP Media Main Vocalist, Lead Dancer
9 Kim Jun Seo (김준서) OUI Entertainment Lead Dancer, Vocalist, Rapper, Visual
1 Jeon Do Yum (전도염) Play M Entertainment Main Dancer, Lead Rapper, Vocalist, Center
2 Jung Jin Sung (정진성) Play M Entertainment Main Dancer, Main Vocalist, Visual
5 Jeong Taek Hyeon (정택현) Management Air Main Rapper, Vocalist, Face of the Group
7 Park Sung Won (박성원) A team Entertainment Main Rapper, Vocalist, Maknae


Mini albums[]

Digital singles[]



Official links[]