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Jonghyun debuted as a songwriter when writing the Korean lyrics to SHINee's Juliette", which was the featured on their second mini album, Romeo. Jonghyun went on to participate in the writing of two songs on SHINee's s album, "Lucifer". The first, "Up & Down", was co-written with Misfit with the rap being written by Minho. The second, "욕 (Obsession)", was completely written by Jonghyun (Rap written by Minho). In 2012, Jonghyun co-wrote the lyrics to the song with "알람시계" (Alarm Clock)" with Minho, a song about wishing to wake up from the nightmare of a past break up,and wrote the lyrics to "늘 그자리에 (Honesty). Both songs were featured on the mini album, "Sherlock". For SHINee's misconceptions series, Jonghyun wrote the lyrics to: "Spoiler", "오르골 (Orgel)", "Dangerous (Medusa II)" (which was co-written with Jo Yun Kyeong), "버리고 가 (Better Off)" and "너와 나의 거리 (Selene 6.23)". In October 2013, Jonghyun wrote the lyrics to "상사병 (Symptoms)" which was featured on SHINee's album, "Everybody". In May 2015, he wrote the title track of SHINee's fourth Korean album, "Odd", "View". He also wrote and composed the track "Odd Eye" on the same album, and the co-wrote the lyrics to the track, "Chocolate", on the repackage album released in August 2015.

In October 2013, Jonghyun debuted as a composer of the track "우울시계 (A Gloomy Clock)" which was featured on IU's third Korean album, "Modern Times". "Red Candle", which was also composed and written by Jonghyun, was released by Son Dam Bi. In March 2015, another track that Jonghyun both composed and wrote, "Playboy", was featured on EXO's second Korean album. In April 2015, Lim Kim released "No More" on her third mini album, "Simple Mind", which Jonghyun also wrote and composed. Jonghyun also wrote "Pretty Boy", which was featured on Taemin's solo album, "Ace", in August 2014. He recently wrote and composed the song, "Breathe" featured on Lee Hi's most recent half album, which was released on March 9, 2016.​
Concerts & Tours
Concerts 
Discography

Albums Mini Albums Compilation Albums Digital Singles
  • [2016.03.18] Your Voice (한마디) (with Heritage)
  • [2016.12.09] Inspiration
OSTs
  • 2011: "So Goodbye" [City Hunter OST]
  • 2013: "1 Out of 100" (백분의 일) [The King's Dream OST]
  • 2014: "SHE" [Birth of a Beauty OST]
  • 2015: "That Name" (그 이름) (with Taemin) [Who Are You: School 2015 OST]
  • 2015: "Beautiful Lady" [Oh My Venus OST]
Featurings
  • 2008: "Y Si Fuera Ella" (혜야) [SHINee - Lucifer]
  • 2014: "Breath" (숨소리) (with Taeyeon) [S.M. The Ballad - Breath]
  • 2014: "A Day Without You" (하루) (with Chen) [S.M. The Ballad - Breath]
  • 2015: "Only The Words I Love You" (사랑해 이 말 밖엔) [Two Yoo Project - Sugar Man]
  • 2015: "Elevator" (엘리베이터) [Monthly Live Connection Track 1]
  • 2015: "I Guess Now It's the Fall" (가을이긴 한가 봐) (with Go Young-bae) [Monthly Live Connection Track 2]
  • 2015: "Aewol" (애월 (愛月)) [Monthly Live Connection Track 3]
As a featured artist  Filmography
Film  Radio Edit
  • 2014-2017: MBC Blue Night