Question: The lead vocalist of rock band Drug Restaurant is also a member of the cast of a South Korean variety show that airs on what network?

Context paragraphs:
Keep Running (TV series): Keep Running (), previously known as Running Man () before 2017, is a Chinese variety show broadcast on ZRTG: Zhejiang Television.  It is a spin-off from the popular original South Korean variety show "Running Man" by SBS.  It was first aired on 10 October 2014.  The show is classified as a game-variety show, where the MCs and guests complete missions at a landmark to win a race.

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

Weekly Idol: Weekly Idol () is a South Korean variety show, which airs Wednesdays, 6PM KST, on MBC Every1, MBC's cable and satellite network for comedy and variety shows.  The show is hosted by comedian Jeong Hyeong-don and rapper Defconn.  The set is often referred to as B3 (basement level 3).

Idol School (2014 TV series): Idol School (Hangul: 아이돌 스쿨 ) is a South Korean variety show, which airs on MBC Music, MBC's cable and satellite network for music.  The show is hosted by Jun Hyun-moo, singer Kim Yeon-woo and Sojin of Girl's Day.

2 Days &amp; 1 Night: 2 Days & 1 Night (; also known as 1 Night 2 Days; abbreviated as 1N2D) is a South Korean reality-variety show that airs on KBS2 beginning August 5, 2007.  "1 Night 2 Days" is one of the two segments (the other segment is "The Return of Superman") on "Happy Sunday", airing at 6:25pm KST once a week.  The episodes are also uploaded with English subtitles weekly on YouTube through KBS's official channel.  The show's current cast members are Kim Jong-min, Cha Tae-hyun, Kim Joon-ho, Defconn, Yoon Shi-yoon, and Jung Joon-young.  The show's motto is "Real Wild Road Variety."  Its main concept is to recommend various places of interest that viewers can visit in South Korea.  Filming for every new trip is usually done 2 weeks prior to broadcast on KBS2.

Yang Se-chan: Yang Se-chan (born December 8, 1986), is a South Korean comedian.  As of April 2017, Yang, along with Jeon So-min, were added as a regular cast member of South Korean variety show, "Running Man".

Drug Restaurant: Drug Restaurant (Hangul: 드럭 레스토랑), formerly known as the Jung Joon Young Band (JJY Band) (Hangul: 정준영밴드), is a Korean rock band, formed in Seoul, South Korea in 2014.  The band consists of vocalist and guitarist Jung Joon-young, bassist Jung Seok-won, guitarist Jo Dae-min (Dammit), and drummer Lee Hyun-gyu (Drok.  Q).  The band was formed by Jung, a year after he debuted as solo singer in 2013.  The band released their debut album, "Escape to Hangover", on May 27, 2015.  JJY Band changed their name to Drug Restaurant on May 20, 2016, because they wanted to go with a name that focuses on the band as a whole rather than centering it around the frontman vocalist.

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.

Gwiyomi: The Gwiyomi Song, or Kwiyomi Song (귀요미 송), is a K-pop single by South Korean singer Hari and was released on February 18, 2013.  It was inspired by a gesture from South Korean rapper Jung Ilhoon of boy group BtoB.  The gesture is called 'Gwiyomi Player', that was popularized by South Korean variety show "Weekly Idol" through a segment called "The Aegyo Battle" (Battle of Cuteness) following Ilhoon's guest appearance on the show in October 2012.  The song went on to be a viral success and an Internet meme after Korean Media outlet "Sports Seoul" uploaded a clip of Hari performing the gestures and singing the song.  This video has since inspired many Asian netizens to upload their own versions onto the internet.

Vitamin (TV series): Vitamin is a South Korean variety show, which airs on KBS2, KBS's cable and satellite network for comedy and variety shows.  The show is hosted by Kim Tae-hoon and Lee Hwi-jae.  The show ended its run on March 9, 2017 after 14 years.

Supporting paragraphs: 2 Days &amp; 1 Night Jung Joon-young
Answer: KBS2