The Sound Of Your Heart (Hangul: 마음의 소리 / RR: Maeumui Sori) is a South Korean sitcom starring Lee Kwang-soo and Jung So-min.
 The sitcom is based on the Webtoon "The Sound of Heart."
 The first 10 episodes were aired as a web series on November 7, 2016 through Naver TV Cast on Mondays at 6:00 (KST), and the remaining 10 episodes aired from December 2016.
 The web series hit 100 million views on Sohu TV and ranked No. 1 among Korean dramas on the site.
 On Naver TV Cast, the web series has more than 40 million views in South Korea as of February 2017.
 It is also now airing on Netflix.
Lee Ji-yeon (born February 18, 1984), better known by her stage name Lina is a South Korean singer and musical actress.
 She debuted in 2002 as a member of South Korean R&B duo Isak N Jiyeon and disbanded in 2004.
 She later re-debut as a member of South Korean girl group The Grace in 2005 and the group currently being inactive.
 She currently active as a musical actress.
Unstoppable Marriage () is a South Korean sitcom that aired on KBS2 from November 5, 2007 to May 30, 2008, on Mondays to Fridays at 18:50 for 140 episodes.
 It was adapted from the 2007 South Korean film of the same name.
Dong Young-bae (; born 18 May 1988), better known by his stage name Taeyang (meaning "sun" in Korean) and SOL (when performing in Japan), is a South Korean singer, songwriter and dancer.
 After appearing in Jinusean's music video "A-yo," Taeyang began training under YG Entertainment at the age of 12.
 Six years later, he made his debut in 2006 as a member of the South Korean boy band Big Bang.
 While the quintet's debut was met with lukewarm receptions, their follow-ups cemented their popularity, becoming one of the best-selling digital group of all-time in Asia and one of the best-selling boy bands in the world.
Sunmin (Hangul: 선민, "Katakana": ソンミン, born August 4, 1987) is a South Korean singer who speaks and sings in Korean, Japanese, and English.
 She debuted in 2006, with the single "Keep Holding You," a collaboration with the Japanese R&B singer Toshinobu Kubota.
 Her career was initially focused on the Japanese market, but her work became focused in South Korea from 2009 to 2010.
 She also contributed to original soundtracks of South Korean television series "Master of Study" and "Gloria (2010 TV series)".
 In 2010 to 2011, she was in the main South Korean musical production of "Jekyll & Hyde" as Lucy.
 In 2012 to 2013, she reprised her role as Lucy in the South Korean national tour.
 In spring 2013, Sunmin played Josephine in the South Korean production of "Arsène Lupin", the musical.
The Producers (; lit.
 Producer) is a 2015 South Korean sitcom starring Cha Tae-hyun, Gong Hyo-jin, Kim Soo-hyun, and IU.
 It aired on KBS2 from 15 May 2015 to 20 June 2015 on Fridays and Saturdays at 21:15 for 12 episodes.
Lee Ji-eun (Korean: 이지은 ; born May 16, 1993), better known by her stage name IU (Korean: 아이유 ), is a South Korean singer, songwriter and actress.
 While still in middle school, IU auditioned for various talent agencies with ambitions of becoming a singer.
 She signed with LOEN Entertainment in 2007 as a trainee and began her music career at the age of 15 with her debut album, "Lost and Found".
 Her follow-up albums, "Growing Up" and "IU...IM", brought her mainstream success, but it was through "Good Day" (Korean: 좋은 날 ), the lead single from her 2010 album "Real", that she achieved national stardom.
 "Good Day" spent five consecutive weeks at the top position of South Korea's Gaon Digital Chart and holds the record for spending the most number of weeks at No. 1 along with Psy's "Gangnam Style".
Kwon So-hyun (born August 30, 1994), is a South Korean singer and actress.
 She was known as a member of the South Korean girl group 4Minute, under Cube Entertainment.
 She is also a former member of the South Korean girl group, Orange.
 Before June 15, 2016 (end of her contract with Cube), Sohyun left 4Minute and the record label along with members Nam Ji-hyun, Heo Ga-yoon, and Jeon Ji-yoon.
Han Sun-hwa (born October 6, 1990), is a South Korean singer and actress.
 She is a former member of the South Korean girl group Secret.
 She made her television debut in 2004 while participating in SBS's "Superstar Survival" as a finalist, and in 2009, she was a regular cast on a variety show called "Invincible Youth".
 Aside from music, she also ventured into acting and made her debut in the 2010 drama, "More Charming By The Day".
 She also acted in several dramas with supporting roles in "Ad Genius Lee Tae-baek", "God's Gift - 14 Days", and "Marriage, Not Dating".
 In 2014 she finally starred as a lead actress on MBC's weekend drama "Rosy Lovers" as Baek Jang Mi co-starring with actor Lee Jang Woo.
 CNN International Seoul listed Sunhwa as one of the nine rising "It" stars in Korean entertainment citing her as a "multi-tasking" artist.
 Her portrayal of Kang Se-Ah in the 2014 TVN drama, "Marriage, Not Dating" earned her a nomination for "Best Youth Actress" at the 16th Seoul International Youth Film Festival.
 In 2014, her portrayal of Jang-Mi from "Rosy Lovers" and Jenny from "God's Gift 14 Day"s won her two best new actress awards from MBC and SBS Drama Awards.
 It was confirmed on September 26, 2016 that Sunhwa had not renewed her contract with TS Entertainment and will officially part ways in October.
 On October 14, 2016 Sunhwa joined Huayi Brothers as an actress.
Lee Ho-yang (Korean: 이호양 ), better known by his stage name Shinsadong Tiger (Korean: 신사동호랭이 "Shinsadong Horaengi") is a South Korean music producer and songwriter.
 Even after debuting in 2001 at the age of 18 (19 in Korean age), he has worked many odd jobs to fund his music career.
 He has become a prominent figure in the Korean pop music industry and is responsible for a number of popular songs.
 In 2010, he was named the "New Generation Producer" at the 18th Korean Culture Entertainment Awards, and in 2011 he was named as one of the most influential figures in the South Korean music industry by OSEN.
 Lee has recently started his own label, AB Entertainment, in which he has debuted his own girl group named EXID.

Question: What South Korean sitcom starred a South Korean singer and actress who began her music career at the age of 15?
Answer: The Producers