Hornist Hyung Ju Kim was admitted to Seoul Arts High School as the top student and during his studies, he was also admitted early to the Korea National University of Arts School of Music as a gifted student where he graduated. He then went to Germany and studied under Marie Luise Neunecker at Hochschule für Musik Hanns Eisler Berlin, becoming the first Korean to do so and graduated with top honors in the master's program.

Early on, he demonstrated his musical talent by winning first place at the Korean Music Association Competition and the Woo Hyun Competition. He also won first place at the Seoul National University Wind Competition, Yonsei University Wind Competition, Overseas Dispatch Competition, Busan Music Competition, and the Dong-A Music Competition (being the youngest winner). He achieved third place at the Jeju International Wind Competition (2013 and 2017) and reached the finals of the German ARD Competition, showcasing his musical prowess in numerous domestic and international competitions. Beginning with a solo recital as a Kumho Young Artist, he has performed as a soloist with various orchestras including the Incheon Philharmonic Orchestra, Bucheon Philharmonic Orchestra, Busan Philharmonic Orchestra, Suwon Philharmonic Orchestra, KNUA Wind Orchestra, and KNUA Symphony Orchestra. He also collaborated with Das Sinfonie Orchester Berlin (at Berliner Philharmonie Chamber Hall), performed a solo recital at Ein Musikalisches Fest (Kronungskutschen Hall), and participated in the Berliner Philharmoniker's "The Horn-Marathon" and their Christmas Concert "Ho, Ho, Horn," engaging with audiences both domestically and internationally through numerous solo and chamber music performances.

Additionally, he has been active in orchestral performances as a guest principal and tour performer with the Kölner Kammer Orchester, and has held positions with the Seoul Philharmonic Orchestra, National Symphony Orchestra (formerly the Korean Symphony Orchestra), Seongnam Philharmonic Orchestra, and Ensemble TIMF. Hornist Hyung Ju Kim, who studied under Seok-jun Lee, Dong-gon Lee, Dae-woong Seok, Marie Luise Neunecker, and Georg Schreckenberger, is currently the associate principal of the Gyeonggi Philharmonic Orchestra, principal member of the Korean Chamber Orchestra (formerly the Baroque Ensemble), a member of Ensemble TIMF, EOS Ensemble, and a horn researcher at the Korea Wind Instrument Promotion Agency. He is also dedicated to nurturing the next generation of musicians as a faculty member at Sangmyung University and Hansei University.