Shin Jung Hyun & Yup Juns was a South Korean rock band formed by Shin Jung-hyeon, Lee Nam-yi, and Kim Ho-sik. "Yup Jun" is an ad hoc romanisation of yeopjeon, a kind of old brass coin with a square hole.
The band's album Shin Jung Hyun & Yup Juns Vol. 1, released in 1974, sold more than one million copies. Its most popular song "The Beauty", was nicknamed "the song of thirty million". It was used as background music in the Lee Man-hee film A Girl Who Looks Like the Sun released that year, one of Lee's last before his death in 1975.
The band's next album, Shin Jung Hyun & Yup Juns Vol. 2, was an implicit rebuke to the dictator Park Chung-hee: according to Shin's son Shin Daechul, Park had demanded that Shin make a song praising Park, but instead Shin and his fellow band members wrote the lyrics of the album's song "Beautiful Rivers and Mountains" about the beautiful natural landscapes of Korea. This led to increasing troubles for the band.