2005–2014: Career beginnings Jonghyun was scouted by
SM Entertainment when he was 15 years old, after playing in a song festival with his band at school. As a trainee, he featured on the
Zhang Liyin song "Wrongly Given Love". Jonghyun debuted as part of the five-member boy group
Shinee on May 25, 2008, on
SBS'
Inkigayo. He started contributing to the group as a songwriter the following year, writing the lyrics to their fourth Korean single, "Juliette", which was included on the group's second EP,
Romeo. Jonghyun said he was inspired by the 1968 film
Romeo and Juliet, and he wanted to write a romance story that "will make everyone interested but also a story which everyone can identify with". Jonghyun was one of twenty idols from various South Korean groups that recorded the song "Let's Go", which promoted the
2010 G20 Seoul summit. He provided vocals along with labelmates
Sungmin of
Super Junior,
Seohyun of
Girls' Generation and
Luna of
f(x). Jonghyun, along with
TRAX's
Jay, Super Junior's
Kyuhyun, and
Jino, participated in
SM the Ballad, a project group formed by SM Entertainment with a focus on ballads. The group released their debut EP,
Miss You, on November 29, 2010. Jonghyun appeared on
KBS'
Immortal Songs: Singing the Legend, a 2011 television competition program where singers perform new versions of old songs by "legendary singers". Jonghyun won the first round and defeated his labelmate,
Yesung of Super Junior, but left the show after the first episode due to his busy schedule. The show subsequently came under fire from viewers, who claimed the program's harsh elimination method and structure left Jonghyun in tears on stage. Jonghyun received composition credits for the track "A Gloomy Clock", which was included on
IU's third studio album,
Modern Times, in October 2013. The song, which Jonghyun gave to IU as a friend, also features his vocals. Two months later,
Son Dam-bi released the song "Red Candle", which was also written by Jonghyun. He provided vocal direction for the track, in addition to lyric writing and composition. Jonghyun began hosting the
MBC radio program ''
in February 2014. MBC said they chose Jonghyun to host because of his dedication to music-related activities and passion for music. He later began a segment on the show where he wrote songs based on stories submitted by listeners. After a four-year hiatus, SM the Ballad returned on February 13, with a new line-up and their second EP, Breath''. Jonghyun performed the title track "Breath" as a collaboration with Girls' Generation's
Taeyeon. In August, fellow Shinee member
Taemin released his first EP,
Ace, for which Jonghyun wrote the track "Pretty Boy".
2015–2016: Base, Story Op.1 and She Is On January 12, 2015, Jonghyun made his solo debut with his first EP,
Base. The EP was promoted with two singles, "Deja-Boo" and "Crazy (Guilty Pleasure)". Jonghyun wrote the lyrics to every song on the EP, which featured collaborations with
Zion.T,
Younha,
Wheesung and
Iron. It peaked at number one on both the
Billboard World Albums Chart and the
Gaon Album Chart. On January 9, television network
Mnet confirmed that Jonghyun would appear on the entertainment program
4 Things Show. Taemin,
Davichi's
Minkyung, and Zion.T appeared as Jonghyun's friends during the episode. In March 2015, Jonghyun composed and wrote the song "Playboy", which was included in
Exo's second Korean album,
Exodus. A month later,
Lim Kim released "No More" on her third EP,
Simple Mind, which was also composed and written by Jonghyun. Jonghyun released a new compilation album of self-composed songs originally performed on his radio show MBC
Blue Night. The compilation album,
Story Op.1, was released on September 17, 2015. The following month, he held his first solo concert, The Story by Jonghyun, as part of SM Entertainment's concert series
The Agit. He performed a total of 12 sold-out shows. Each concert featured a different guest, including Shinee's
Onew and Taemin, IU, Zion.T,
Jung-in, Lim Kim, Oksang Dalbit, Coffee Boy, Nine, Lee Ji-hyoung, Soran, and poet Ha Sang-wook. Jonghyun appeared on the debut of the Mnet program
Monthly Live Connection, which brought together two artists from different musical backgrounds to collaborate on one song. Jonghyun released the single "Elevator" on October 14 as part of the TV program. Following that, he collaborated with
Soran's Go Young-bae in creating the single "I Guess Now It's the Fall", and with singer-songwriter
Jung Joon-young in creating the single "Aewol". The same month, Jonghyun was selected as one of the top five K-pop idol vocalists by a survey completed by 40 anonymous music industry officials. Jonghyun published a novel, titled
Skeleton Flower: Things That Have Been Released and Set Free, on November 19, after previously selling it in limited quantities at his concert. The book contains stories about songs written by Jonghyun, as well as photos that he took himself. Jonghyun composed and wrote the track "Already" for Taemin's first studio album,
Press It, which was released in February 2016. He also composed and wrote a track called "Breathe" for
Lee Hi's album
Seoulite, which was released in March 2016. Jonghyun released a collaboration single with Heritage titled "Your Voice" on March 18, 2016, as part of SM Entertainment's
SM Station project. On May 24, 2016, SM Entertainment released Jonghyun's first studio album,
She Is, consisting of nine songs, most of which were written and composed by Jonghyun. The album spans various genres, including
electro-funk,
EDM, and R&B. Jonghyun said that "one can feel his passion as a singer-songwriter the most" on
She Is. He held a series of concerts, titled Jonghyun – X – Inspiration, in Seoul and Busan, attracting 17,000 spectators.
2017: Story Op.2 and Poet | Artist On March 9, 2017, MBC confirmed that Jonghyun would leave his position as radio host at MBC
Blue Night. The decision came after a lengthy discussion between Jonghyun and the show's staff, who stated, "It's disappointing, but because Shinee's Japanese and North American tour is about to start, he decided to leave." In an interview for
Esquire, he described the experience as a turning point in his life. It was a space where he could explore new things, express himself and connect with the public on a deeper level:
Before, I think I was more comfortable being "the singer Kim Jonghyun." [...] Because it was the one I [and the public] was used to. However, that changed when I started doing radio. As I started expressing my human side to others, I became [more] comfortable with the image of Kim Jonghyun that I revealed through radio. He also enjoyed the routine that came with hosting the midnight radio show. It gave him a sense of stability, which is rare in the entertainment industry. He released his second compilation album, titled
Story Op.2, on April 24, 2017. Jonghyun held a series of 20 concerts, titled The Agit (The Letter), between May and July 2017, at the SM Town Coex Artium in Seoul. Originally, only 12 concerts were planned, but Jonghyun decided to hold eight additional concerts after fans requested more performances. The concerts included songs from the album
Story Op.2, and attracted 14,000 fans. From December 9 to 10, 2017, Jonghyun held a concert titled Inspired at the
SK Olympic Handball Gymnasium. Around the same time, Jonghyun was also working on his new album, which was set to be released in January 2018, and had also finished filming the music video for the lead track. The album,
Poet Artist, was eventually released posthumously on January 23, 2018, with all profits from the album sales to be given to Jonghyun's mother, in addition to establishing a foundation "to help those who are living in difficult circumstances".
Poet Artist debuted at number 177 on the
Billboard 200 with 5,000
equivalent album units, making Jonghyun the fourth Korean soloist to appear on the chart, after
BoA,
G-Dragon and
Taeyang. In 2025, Shinee released a new single album, also titled
Poet Artist. The lead single had been written by Jonghyun prior to his death, and features his vocals. ==Personal life==