Question: What is the name of this South Korean musician, singer-songwriter, record producer and actor in the rock band CNBLUE, who wrote the song You, My Star?

full_context: Document 1: Kim Jong-hyun discography: The discography of the South Korean singer Kim Jong-hyun (most often credited as Jonghyun) consists of one studio album, two compilation album, one extended play, seven singles and six appearances in soundtracks. Jonghyun released his first extended play, "Base", on January 12, 2015. His first compilation album, entitled "Story Op.1", was released on September 17, 2015. Jonghyun released a collaboration single with Heritage titled "Your Voice" on March 18, 2016, for the project Station. On May 24, 2016, he launched his first studio album, "She Is", containing a total of 9 songs. On December 9, 2016, he released the song "Inspiration" for the project Station. He released his second compilation album, titled "Story Op.2", on April 24, 2017.
Document 2: Jang Wooyoung: Jang Woo-young (Hangul: 장우영; Hanja: 張祐榮; born on April 30, 1989), generally known as Wooyoung, is a South Korean singer, songwriter and actor. He is currently based in South Korea as a member of 2PM, a six-member boy band managed by JYP Entertainment. He is mainly known for his work in 2PM and his role as Jason in the South Korean drama "Dream High". In 2009, he began to study broadcasting at Howon University.
Document 3: Bang Yong-guk: Bang Yong-guk (born March 31, 1990), better known mononymously as Yongguk, is a South Korean rapper, songwriter and record producer. He is best known as the leader of the South Korean boy group B.A.P under TS Entertainment.
Document 4: Jung Joon-young discography: Jung Joon-young (born February 21, 1989) is a South Korean singer-songwriter, radio DJ, host, actor, and television personality. He first gained recognition in Mnet's reality television talent show, "Superstar K4" (2012), where he finished third place. In 2013, he became the youngest member of KBS's variety show "2 Days & 1 Night" Season 3. Since 2015, Jung is the lead vocalist of a rock band, JJY Band, which changed their name to Drug Restaurant since May 20, 2016.
Document 5: Jung Jin-young (singer): Jung Jin-young (Hangul: 정진영 ; born November 18, 1991), professionally known as Jinyoung, is a South Korean singer, songwriter, record producer, and actor. He is the leader and vocalist of the South Korean boy group B1A4 under WM Entertainment, and has also gained recognition with the television series "Love in the Moonlight" (2016).
Document 6: Bluetory: Bluetory is the debut mini-album by South Korean pop-rock idol band CNBLUE. It was released on January 14, 2010, under FNC Music and distributed by Mnet Media. After being signed to the record label, the quartet was sent to Japan, where it independently released two mini-albums. While working with the band, frontman Jung Yong-hwa was cast in the television drama "You're Beautiful" (2009), where he first garnered recognition.
Document 7: Lee Jong-hyun: Lee Jong-hyun (Hangul: 이종현; ] ; born on May 15, 1990) is a South Korean musician, singer-songwriter and actor. He is the lead guitarist and vocalist of South Korean rock band CNBLUE.
Document 8: Lee Jung-shin: Lee Jung-shin (이정신, born on September 15, 1991) is a South Korean musician, singer, rapper, and actor. He is the bassist of South Korean rock band CNBLUE, which debuted in January 2010 in South Korea.
Document 9: You, My Star: "You, My Star" (별, 그대 ; "Byeol, Geudae " ) is a song by South Korean musician Jung Yong-hwa of CNBLUE. Written in dedication to his fans, the song was released in December 23, 2013, under FNC Entertainment. Two days prior, Jung performed the song on the year-end music program "SBS Gayo Daejeon". "You, My Star" debuted and peaked at number 22 no South Korea's national Gaon Digital Chart; all proceeds went to the label's charity Love FNC.
Document 10: Jung Joon-young: Jung Joon-young (born February 21, 1989) is a South Korean singer-songwriter, radio DJ, host, actor, and television personality. He first gained recognition in Mnet's reality television talent show, "Superstar K4" (2012), where he finished third place. In 2013, he became the youngest member of KBS's variety show "2 Days & 1 Night" Season 3. He hosted his own radio program titled MBC FM's "Jung Joon-young's Simsimtapa" (2014) and made his big screen debut in "Love Forecast" (2015). Since 2015, Jung is the lead vocalist of rock band Drug Restaurant, previously known as JJY Band, releasing their first album "Escape to Hangover" in May 2015
Document 11: Kang Min-hyuk: Kang Min-hyuk (; born on June 28, 1991) is a South Korean musician, singer-songwriter, and actor. He is the drummer of South Korean rock band CNBLUE.
Document 12: Jung Yong-hwa: Jung Yong-hwa (; ] ; born June 22, 1989) is a South Korean musician, singer-songwriter, record producer and actor. He is the leader, lead vocalist and rhythm guitarist of the rock band CNBLUE. Jung made his television debut in "You're Beautiful" (2009), and has since starred in television dramas "Heartstrings" (2011), "Marry Him If You Dare" (2013) and "The Three Musketeers" (2014). In 2015, Jung made his solo debut with the album "One Fine Day".
Document 13: Mileage (song): "Mileage" (마일리지 ; "Mailliji " ) is a song by South Korean musicians Jung Yong-hwa of CNBLUE and Yang Dong-geun (YDG). Released on January 9, 2015, it serves as the pre-release single of the former's debut solo studio album "One Fine Day" (2015). While filming for the television series "The Three Musketeers" (2014), Jung was inspired by YDG's affection towards him family on set to compose the song. Upon release of Jung's album, the two performed "Mileage" on music programs and talk shows. The song debuted and peaked at number 57 on South Korea's national Gaon Digital Chart, selling over 78,000 digital downloads since its release.
Document 14: Yook Sung-jae: Yook Sung-jae (; born (1995--) 2, 1995 ) is a South Korean singer, actor and host. He is a member of the boy group BtoB and its sub-group, BtoB Blue. Aside from his group's activities, Yook is known for acting in television dramas, "" (2015), "" (2015) and "" (2016).
Document 15: Kim Jong-hyun (singer): Kim Jong-hyun (born April 8, 1990), better known by the mononym Jonghyun, is a South Korean singer-songwriter, and radio host. He is a vocalist of the South Korean boy group Shinee, and has further participated in S.M. Entertainment's project group S.M. The Ballad. Jonghyun debuted as a solo artist on January 12, 2015, with his first EP, titled "Base". In the same year, on September 17, Jonghyun released a compilation album, "Story Op.1". On May 24, 2016, Jonghyun released his first studio album, "She Is", followed by his second compilation album, "Story Op.2" on April 24, 2017.
ground_truth: Jung Yong-hwa