Joseph Yun is a guitarist and composer who is described as Korean-born and who works in the Los Angeles area. His only release as a leader is the 2019 fusion album It's Time, recorded in four sessions between 2017 and the summer of 2019 and issued on his own, with the British drummer Simon Phillips on two of its seven tracks. This is a short profile because very little about him has been published.

What is known comes from a handful of sources. The jazz site Something Else! calls him Korean-born in an interview by Preston Frazier of May 27, 2020, and nothing found gives his Hangul name, his birth date, his birthplace within Korea, his family, or the year he left. His own YouTube channel describes him as a Los Angeles guitarist, composer and producer. In the interview he says he had been playing for about ten years when he enrolled at the Guitar Institute of Technology at MI-Hollywood (Musicians Institute) in 2014, and that the title track of his album was his graduation song there that year. He began writing and recording his own music in 2017.

It's Time was made in four sessions with different players and studios, finished in the summer of 2019. The first, in the summer of 2017, brought in the bassist Ernest Tibbs, the drummer Chaun D. Horton and the second guitarist Victor Chu. For the second session Yun wrote to Simon Phillips, who answered first and then suggested studios, songs and other musicians; Phillips played drums on "Far Away Place" and "Love" with Tibbs on bass and the pianist Jeff Colella on grand piano, recorded at Brotheryn Studio in Ojai, California. Discogs credits the remaining tracks to the bassists Josh Jong and Nick Campbell, the drummers Efa Etoroma Jr. and Wesley Ritenour and the keyboardist Julian Pollack. The seven tracks, 38 minutes in all, were released on September 1, 2019 under the copyright of Joseph Yun himself, on CD (Discogs lists it as not on a label) and on the streaming services. He writes all of his own music.

His website carried short endorsements from the pianist David Benoit and the guitarist Dean Brown. Benoit compared Yun's melodic sense to that of Larry Carlton and his blues feel to Joe Bonamassa, and said he surrounds himself with fusion players such as Tibbs and Phillips; Brown praised the album's melodic, imaginative compositions and the precision and passion of the playing. In the 2020 interview Yun said he works as a sideman for Benoit, and that during the COVID-19 pandemic the two were recording remotely and planning video projects. No recording credit for that work has been found.

After the album he filmed a live concert of about 50 minutes and seven songs with Tibbs, Pollack (who also plays as J3po) and the drummer Donald Barrett, edited it himself and put the videos on his YouTube channel; in May 2020 he said he was considering a full live album and planned to write one or two more songs for future shows. No later release under his name has been found on Discogs or Apple Music.

What is not known is most of the rest: his age, where he was born and raised, how he came to the United States, what he has recorded since 2020, and whether he is still based in Los Angeles. Citizenship is not stated anywhere found; the Nationality field reflects his Korean birth as described by Something Else!, not a stated passport.

Discogs files It's Time under jazz, funk and soul, and blues, with the style Fusion, and Apple Music lists it as jazz. The comparison to Larry Carlton and Joe Bonamassa comes from the Benoit endorsement on his own website, so it is promotional rather than critical. In the interview Yun names the guitarists Dean Brown and Allen Hinds as influences, having seen Tibbs play with them, and lists five favorite albums: Julian Lage's Arclight: Live in Los Angeles, Dean Brown's Rolajafufu, Allen Hinds's Monkeys and Slides, John Mayer's Where the Light Is: Live in Los Angeles and Richie Kotzen and Greg Howe's Tilt.

His main guitar is a 1966 Fender Stratocaster with its original pickups, played through a Fuchs Blackjack 21 amplifier head and a custom cabinet by Bob Burt; he says he is a Fuchs artist.