Phantast (사각계열 or 黒夢ギギギ) is a Korean visual kei rock band formed in 2007. Originally formed as a two-member band, the group's current line-up consists of vocalist and songwriter Lee Ki-seok, bassist Lee Ji-hun, lead guitarists Lee Hyung-soo and Lee Jin-sung and drummer Jeong Yeong-ju. Since its formation, Phantast has made an impact in the visual kei and rock music scene, earning fans both domestically and internationally. The band has released several full-length albums and EPs, and has also performed in numerous music festivals and concerts around the world. The band's music is known for its unique style, combining elements of emotional emo rock with heavy metal influences. Songs often feature guitar and bass riffs that are played in tandem, creating a wall of sound that is reminiscent of 80s speed metal. Phantast's lyrics often touch on themes of alienation, pain, and betrayal, adding further depth to the band's sound. Phantast has become one of the most successful visual kei bands of recent years, having created a strong bond with its fans that transcends language barriers. The band has built an impressive following, known for its intense and passionate performances that have been described as being "more than just a show, but a journey for the soul".