|Stage Name||Birth Name||Position||Birthday||Age||Height||Star Sign||C Y||BT Sort descending|
|Joshua 조슈아||Hong Jisoo||Vocal||22||176 cm or 5'9½"||Capricorn||Pig||A|
|Vernon 버논||Choi Hansol||Rapper||20||176 cm or 5'9½"||Aquarius||Ox||A|
|Dino 디노||Lee Chan||Dancer, Maknae||19||170 cm or 5'7"||Aquarius||Tiger||A|
|Wonwoo 원우||Jeon Wonwoo||Rapper||22||180 cm or 5'11"||Cancer||Rat||A|
|Woozi 우지||Lee Jihoon||Vocal||21||165 cm or 5'5"||Sagittarius||Rat||A|
|Mingyu 민규||Kim Mingyu||Rapper||21||184 cm or 6'½"||Aries||Ox||B|
|Jeonghan 정한||Yoon Jeonghan||Vocal||23||175 cm or 5'9"||Libra||Pig||B|
|Seungkwan 승관||Boo Seungkwan||Vocal||20||172 cm or 5'7½"||Capricorn||Ox||B|
|Jun 준||Wen Junhui||Dancer||22||180 cm or 5'11"||Gemini||Rat||B|
|Hoshi 호시||Kwon Soonyoung||Dancer||22||178 cm or 5'10"||Gemini||Rat||B|
|S.Coups 에스쿱스||Choi Seungcheol||Leader, Rapper||23||177 cm or 5'9½"||Leo||Pig||AB|
|The8 디에잇||Xu Minghao||Dancer||21||178 cm or 5'10"||Scorpio||Ox||O|
|Dokyeom (DK) 도겸||Lee Seokmin||Vocal||21||178 cm or 5'10"||Aquarius||Ox||O|
Seventeen 세븐틴 is a male idol group formed by Pledis Entertainment in 2015. The group is separated into three different sub-units with different areas of specialization: a hip-hop unit, vocal unit, and a performance unit.
The group's members are deeply involved in the composition and production of their tracks and their choreography, leading to them being given a nickname as a "self-producing" idol group.
Starting in 2013, Seventeen appeared in regular live broadcasts of a show called "17TV" on the online streaming platform UStream. During broadcasts, fans were invited to watch Seventeen training in their practice room. The show had multiple seasons during which the trainees were introduced to the public, with some seasons ending in Like Seventeen concerts.
Prior to their debut, the group appeared in the reality TV show "Seventeen Project: Big Debut Plan," broadcast on MBC between May 2-26, 2015. The show concluded with their debut showcase.
Seventeen debuted on May 26 with a live showcase televised on MBC. They were the first male Kpop group to debut with a one-hour live showcase on a major broadcasting channel, with label mates Lizzy and Raina from After School serving as MCs. Three days later, their first EP 17 Carat was digitally released, along with the music video for their lead track "Adore U 아낀다." The physical album was released on June 2. The album ranked ninth on the Billboard World Albums chart a week after its release and peaked at eighth, staying on the chart for a total of eleven weeks. 17 Carat later became the longest-charting Kpop album of the year in the US and was the only rookie album to appear on Billboard's "10 Best K-pop Albums of 2015" ranking.
On September 10, Seventeen's second EP Boys Be was released in two versions together with the music video for the lead track, "Mansae." Pre-order sales for Boys Be surpassed 30,000 album copies, and it later became the highest-selling rookie album of 2015. The album debuted at number one on Billboard's World Albums Chart and earned the group awards at the Golden Disk Awards, Seoul Music Awards, and Gaon Chart K-Pop Awards. Seventeen was the only Kpop group on Billboard's "21 Under 21 2015: Music's Hottest Young Stars" list. On December 4, a digital single titled "Q&A" was released by members S.Coups, Woozi, and Vernon, featuring singer Ailee. The track was produced by Woozi.
Seventeen held a four-date concert series titled 2015 Like Seventeen – Boys Wish from December 24-26 as an end-of-year celebration at Yongsan Art Hall in Seoul. All tickets were sold out within one minute. After the concerts' success, Seventeen held two more concerts on February 13 and 14 entitled Like Seventeen – Boys Wish Encore Concert, which sold out in five minutes. At the second concert the official fan club name, Carat 캐럿, was announced.
Seventeen's first full-length studio album Love & Letter was released at midnight local time on April 25, 2016. The album was released with dual Love and Letter versions, similar to their previously released album Boys Be, which also had two versions. The album sold over 150,000 copies prior to release and charted at No. 1 on the Oricon Weekly Pop Album Charts in Japan. The music video for the lead track, "예쁘다 Pretty U," was released on April 24 after the group's showcase. The album debuted on the Gaon Album Chart at first place and Billboard's World Albums Chart at third place. Seventeen received their first win on a music show on May 4 with "예쁘다 Pretty U." The album placed fourth on Gaon's 2016 half yearly physical album charts, Seventeen being the highest-charting rookie group on the list.
Love & Letter was re-released as the album Love & Letter Repackage on July 4. Wonwoo was reportedly unable to participate in promotions due to acute gastritis. Promotions for the lead single "아주 Nice (Very Nice)" were immediately followed by Seventeen's 1st Asia Tour 2016 Shining Diamonds, which included venues in Japan, Singapore, Australia, and China. The tour started in South Korea with 2016 Like Seventeen – Shining Diamond on July 30 and 31, for which 13,000 tickets were sold.
On November 1, Seventeen's hip-hop unit released their first mixtape since debut titled Check-In, following announcements and teasers the previous day. The mixtape was accompanied by a music video.