Hahn Choong-wan (한충완) is a Korean jazz pianist and educator who is usually named in Korean press as part of the first generation of Korean musicians to study at Berklee College of Music. He is billed Hahn Choong Wan on streaming services and Discogs, Hahn Choong-wan by the Korea JoongAng Daily, ChoongWan Hahn on the covers of his later albums and 한충완 in Korean sources. In the biographies of other Korean Berklee returnees he often appears as Han Chung-wan. He has made eight albums between 1994 and 2022, played piano or keyboards on records for singers and bands from 1985 on, and taught for decades in the practical music department of the Seoul Institute of the Arts.

The Seoul Shinmun, writing in 1999, put his birth year at 1960 (it named him, the pianist Chung Won-young, the guitarist Han Sang-won and the pianist Kim Kwang-min as four Berklee returnees of the same age, all born in 1960), and the Korea JoongAng Daily gave his age as 43 in August 2004. MusicBrainz lists 1961. His exact birth date and birthplace are not published. According to the JoongAng Daily he graduated from Seoul National University with a degree in agriculture before going to Boston to study jazz at Berklee, and he was known among musicians as part of the first Berklee generation. The years he spent at Berklee are not stated in the sources found. He is a different musician from the Berklee-trained pianist Chung Won-young (정원영), who was born the same year and whom the JoongAng Daily names beside him as a peer; the two are often grouped together, and they shared the piano chair in the group Super Band in 1994.

His earliest credits on Discogs are from 1985, when he is listed with keyboards and as arranger on the singer Yang Hee-eun's album 찔레꽃 피면 (SRB Records SBK 0047), and with piano on the duo Ttaro Tto Gachi's third album (SRB Records SBK-0048). The Seoul Shinmun's 1999 profile confirms the Yang Hee-eun connection, saying he took part in producing and playing on that album as well as on records by the fusion group Bom Yeoreum Gaeul Gyeoul, and that this made his name known beyond the jazz scene. Discogs adds piano and synthesizer on a 1991 record by Kim Soo-chul (Seoul Records SPDR-250) and Korean Wikipedia lists him as the pianist on Bom Yeoreum Gaeul Gyeoul's fourth album I Photograph to Remember (1993), which was recorded in the United States and also lists the guitarist Han Sang-won.

By April 1994 the Seoul Shinmun described him as a lecturer in applied music at the Seoul Arts College (서울예전) and as one of the two pianists of Super Band, a fusion group made of Berklee returnees and members of Bom Yeoreum Gaeul Gyeoul that was billed to play the second Spring Jazz Festival at the Seoul Arts Center on April 30. The line-up in the paper was Chung Won-young and Hahn on piano, Han Sang-won on guitar, Song Hong-seop on bass, Kim Jong-jin on guitar and Jeon Tae-gwan on drums. The first half of the same evening was given to the saxophonist Lee Jeong-sik and the Seoul Jazz Orchestra. A 1996 album, Korea Super Session 2, is billed jointly to Han Sang-won, Hahn Choong-wan and Kim Byeong-chan; it has seven tracks and Bugs files it as fusion jazz. By 1999 he and Kim Byeong-chan, another Berklee alumnus, had formed a band called Tri Beam (트라이빔).

His own albums begin with Love Song (Bugs and Apple Music date it 1994; the sleeve is marked 한충완 One, with the subtitle Smooth Jazz). The second, Corea Corea (July 17, 1995), is the one the press keeps returning to. The JoongAng Daily says it contains "A Song for My Daughter" and a Korean nursery rhyme arranged in a jazz rhythm (the track list includes 학교종, the school bell song), and that it was reissued in 2004 after jazz fans rediscovered it; the 2004 reissue, billed on Bugs as 재발매 (reissue), adds a bonus remix of "우리는 하나" (We Are One) with the rappers Gaeko and Choiza of Dynamic Duo, whose Korean Wikipedia pages list the guest verse. The third, Off-Road (June 26, 2001), is described on a listener's upload of its title track as world music and jazz fusion; its title track was chosen for the 2001 compilation Music From Korea 2001, a promotional set from the Korea Music Promotion Center and the Ministry of Culture and Tourism that was presented at the MIDEM festival. The fourth, 회색 (回色) (Gray, December 23, 2003, Ion Music), is a fifteen-track, hour-long set that includes two tracks titled Improv. and pieces such as "As Good As It Gets" and "무언가 (無言歌)".

Beside his own records he kept working as a session and arranging pianist for Korean pop around the turn of the century: Discogs credits him with piano and keyboards on Yuri Sangja's home (Doremi Records DRMCD-1719, 2000), with piano on "이젠 쉼" on the compilation Long Live Dream Factory (YBM Seoul Records SRCD-3592, 2000), and as a featured artist on track 10, "확 (꺼져 버려)", of the trumpeter Juhan Lee's 10+1 Ten Plus One (Ponycanyon Korea PCSD00005 and O2 Music O2PD-002, 2001), an album on which the Berklee pianists Chung Won-young (track 14) and Kim Kwang-min (track 15) are also featured.

In August 2004 the JoongAng Daily and the Seoul Shinmun both profiled him as he prepared a run of concerts at the Jeongdong Theater in Seoul, a run that the two papers date from early August to August 22, under a title that translates roughly as an exciting jazz concert told by a father who plays piano. The Seoul Shinmun called it the first jazz concert with spoken commentary in Korea and said it was aimed at schoolchildren on summer holiday and at adults new to jazz; the plan was to play children's songs such as "학교종이 땡땡땡" and "종이비행기", the theme of an animated series, jazz standards such as "Take the A Train" and "Autumn Leaves", and his own pieces, with a short history of jazz before each. He is the father of four, and he told the JoongAng Daily that he tries to put a song for his children on each album, and the track lists bear it out: "딸에게 보내는 노래" (A Song for My Daughter) on Corea Corea and "딸에게" (To My Daughter) on Off-Road. The JoongAng Daily gave his title as Dean of Practical Music at the Seoul Institute of the Arts; the Seoul Shinmun that July said he was teaching in its practical music department and that his fourth album, 회색, had come out the previous winter.

He appears in the list of judges of the 2009 KBS Creative Children's Song Contest as a professor of practical music at the Seoul Institute of the Arts (Korean Wikipedia). In 2012 he is the pianist on the bassist Wonsool Lee's first leader album Point of Contact (released in January 2012), a nine-player set of jazz combo and chamber instruments. For its EBS Space concert on April 18, 2012 he is billed on piano beside Lee, the guitarist Oh Jeong-su and the drummer Kim Hong-gi, with flute, clarinet, violin, cello and horn. EBS's preview says Lee moves smoothly between the jazz players, Hahn and Oh among them, and the orchestral players, and the Bugs essay on the album sets Hahn's piano and Oh's guitar, a driving post-bop sound, against the modern sound of the strings. The album won Best Jazz & Crossover Jazz Album at the 10th Korean Music Awards in February 2013. A Munhwanews video series on leading Korean artists introduced him in 2015 as Professor Hahn Choong-wan, a musician as comfortable as a pair of jeans.

From 2015 his albums turn to singers and electronics. Feel So Alive (November 24, 2015, TiGon, distributed by Mirrorball Music) is a twelve-track vocal record with seven guest singers (김도연, 이동하, 김유나, 이동은, 이진경, 신종욱 and 김수영); Bugs files it under ballad. Flower of Life (November 8, 2019) is an eleven-track instrumental set that Bugs files under electronic music and jazz with the styles acid house and acid jazz. Genesis (November 5, 2021), five tracks including "Overture (序曲)" and "Heaven, Earth & Humanoid", is filed as electronic and indie electronic. Digital Mind (November 3, 2022), eight tracks, is described by Mirrorball Music as electronica and jazz and by Bugs as jazz in the electro-jazz and nu jazz style; its cover credits production, composition, arrangement and performance to Hahn, with mixing and mastering by YangSoo Noh. No later release or any notice of his death has been found.

No interview in which he names his influences has been found, so this section sticks to what the records and the press show. The JoongAng Daily presented him as someone who looks the part of a jazz pianist, with bleached silver hair, jeans and a leather jacket and a motorcycle for transport. The Seoul Shinmun's profile quotes him saying that he enjoys breaking down the walls between genres, wants to record an album of jazz-arranged children's songs and pop songs, and that when he plays he cares more about how much he hears than about finger technique, preferring feeling to rote memorization of a score. Both papers describe a musician who treats education as part of the work: he lectures on jazz history, teaches at a university and told the Seoul Shinmun that his students keep him in touch with new styles.

The records show a pianist who moves between acoustic jazz, jazz fusion and electronic music. The 1994 to 2003 albums are filed as jazz on Bugs (contemporary jazz for Off-Road) and the early ones lean toward smooth jazz and fusion, with a Korean nursery rhyme and songs for his daughter among them. The 2015 to 2022 albums are looser in genre: a vocal album filed as ballad, then acid jazz, indie electronic and nu jazz sets.

How much of this is jazz is a fair question, and the sources split. In favour of a jazz identity: the JoongAng Daily and the Seoul Shinmun both call him a jazz pianist, Bugs files Love Song, Corea Corea, Off-Road, 회색 and Korea Super Session 2 as jazz, Apple Music files Love Song, Corea Corea, Off Road and Flower of Life as jazz, the 2001 Music From Korea compilation placed Off-Road in its new age, jazz and world music volume, he played in the 1994 Super Band bill at the Spring Jazz Festival, and EBS Space's preview of Point of Contact names him among its jazz players. Against it: much of his early career is pop session and arranging work (Yang Hee-eun, Kim Soo-chul, Yuri Sangja, Bom Yeoreum Gaeul Gyeoul), Bugs files Feel So Alive as ballad, Genesis as indie electronic and Flower of Life partly as electronic, and Apple Music files Feel So Alive under K-pop and Genesis and Digital Mind under electronica. On balance he is best described as a Berklee-trained jazz pianist and educator whose records run from smooth jazz and fusion to electronic jazz.