What's Happening?
 is the fourth mini-album recorded by the South Korean boy band B1A4, which was released by WM Entertainment on May 6, 2013.
 The track "What's Happening?"
 (also known as "What's Going On?")
 was used as the lead single of the album.
 The song "What's Happening(이게 무슨 일이야) took the first rank on the ground wave in Korea, May, 2013.
Love in the Moonlight () is a South Korean television series starring Park Bo-gum and Kim Yoo-jung with Jinyoung, Chae Soo-bin and Kwak Dong-yeon.
 It is a coming-of-age story and youth romance set during 19th-century Joseon Dynasty based on the novel "" which was first serialized on Naver in 2013 and consequently published as a five-part series of books in 2015.
 It aired every Monday and Tuesday from August 22, 2016 until October 18, 2016 on KBS2 at 22:00 (KST) for 18 episodes.
Ignition is the first full-length album released by B1A4 under WM Entertainment.
 The album was released on March 14, 2012 by WM Entertainment and their distributing label Pony Canyon Korea.
 The album spawned 2 singles namely "This Time Is Over" and "Baby I'm Sorry" which is the title track written and composed by the group's leader Jinyoung.
 A special edition of the album was released on May 24, 2012.
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).
Gong Chan-sik (born August 14, 1993), better known by his stage name Gongchan, is a South Korean singer and actor.
 He is a member of the South Korean boy group B1A4.
Cha Sun-woo (born September 5, 1992), better known by his stage name Baro, is a South Korean singer, rapper, and actor.
 He is the main rapper of South Korean boy group B1A4 and debuted alongside with the group on the stage of MBC "Show!
 Music Core" on April 23, 2011.
 He made his acting debut through the hit 2013 cable drama "Reply 1994" and additionally received critical acclaim for his role in the 2014 drama "God's Gift - 14 Days".
 Baro won 12 medals in Idol Star Athletics Championships with 3 golds, 7 silvers and 2 bronzes.
Shin Dong-woo (born June 16, 1991), better known by his stage name CNU, is a South Korean singer and actor.
 He is best known for being a member of the South Korean boy group B1A4.
 In 2012, he appeared in the KBS sitcom "Sent From Heaven".
In the Wind is the third mini-album played by the South Korean boy band B1A4 and was released by WM Entertainment on November 12, 2012.
 The track "Tried to Walk" was used as the lead single of the EP.
Lee Jung-hwan (; born March 20, 1992), better known by his stage name Sandeul (Hangul: 산들) is a South Korean singer.
 He is a member of the South Korean boy group B1A4, that debuted on April 23, 2011.
 He debuted as a solo artist on October 4, 2016.
Sweet Girl is the sixth mini-album released by B1A4 under WM Entertainment.
 The album was released on August 10, 2015 by WM Entertainment and distributed by LOEN Entertainment.
 The title song of the album, "Sweet Girl", along with the other songs, was produced by leader Jinyoung.
 CNU also produced one song in the album called "Love is Magic".
 B1A4 won a trophy with "Sweet Girl" on the August 19 episode of MBC Every1 Show Champion and earned the title of the tenth most watched music video in America for August by Billboard.

Question: Love in the Moonlight starred what South Korean actor who is the leader and vocalist of the South Korean boy group B1A4 under WM Entertainment?
Answer: Jung Jin-young