"I Luv It" is a song by South Korean musician Psy.
 It was released on May 10, 2017 via YG Entertainment, as the lead single from the musician's eighth studio album, "4X2=8".
 It was co-written by South Korean singer-songwriter Zico from Block B.
Jang Na-ra (Hangul: 장나라 ; born March 18, 1981) is a South Korean musician, record producer and actress active in both the South Korean and Chinese entertainment industries since 2001.
 She rose to prominence with her hit studio album "Sweet Dream" in 2002, and since then has starred in well-received television series "Successful Story of a Bright Girl" (2002), "My Love Patzzi" (2002), "My Bratty Princess" (2005), "Wedding" (2005), "Baby Faced Beauty" (2011), "School 2013" (2012-2013) and "Fated to Love You" (2014).
Kim Seol-hyun (Hangul: 김설현 ; born January 3, 1995), better known by the mononym Seolhyun, is a South Korean singer and actress.
 She is a member of the South Korean girl group AOA and has starred in television dramas "Ugly Alert" (2013) and "Orange Marmalade" (2015).
Orange Marmalade () is a 2015 South Korean television series based on the webtoon of the same name which was serialized on Naver from 2011 to 2013.
 Starring Yeo Jin-goo, Kim Seolhyun, Lee Jong-hyun and Gil Eun-hye, it aired on KBS2 from May 15 to July 24, 2015 on Fridays at 22:35 for 12 episodes.
WoongSan (born Kim Eun Young) is an award-winning South Korean musician, actress and TV show host.
 She has been a leading figure in the jazz music scene in Korea and Japan for over a decade, having performed live over 500 times since her 1998 Japanese debut.
 She is the first Korean-born musician to perform at New York City’s historic Blue Note Jazz Club and has collaborated with many other well-known jazz musicians including Benny Green, Lonnie Plaxico, Rodney Green, Conrad Herwig and Suzuki Hisatsugu.
 She is also well known for training Ali (South Korean singer), a popular K-pop singer.
Orange Marmalade () is a South Korean manhwa series written and illustrated by Seok-woo.
 It was adapted into a TV series of the same name in 2015.
The discography of South Korean musician BoA consists of 17 studio albums, 6 compilation albums, 5 extended plays and numerous singles.
 BoA debuted as a musician through South Korean talent agency S.M. Entertainment at the age of 13 with the album "ID; Peace B" (2000), followed by her debut in Japan with Avex Trax in 2001.
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.
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.
Gil Eun-hye (born (1988--) 05, 1988 ) is a South Korean actress.
 She appeared in the 2015 television drama series" Orange Marmalade".

Question: What South Korean musician starred in Orange Marmalade?
Answer: Lee Jong-hyun