Which singer is also a guitarist, Kang Seung-yoon or Piotr Wiwczarek?
Kang Seung-yoon Kang Seung-yoon (born (1994--) 21, 1994 ), known as Seungyoon, is a South Korean singer-songwriter, record producer, actor, and leader of boy group Winner. In 2010, he participated in the reality television singing contest "Superstar K2" and finished in fourth place. In January 2011, he became a trainee under YG Entertainment and went on to debut as a solo artist in July 2013 and as the leader of Winner in October 2013.
Lee Seung-chul Lee Seung-Cheol (; also spelled Lee Seung-Chul; born December 5, 1966 in Seoul) is a South Korean singer. He was the main vocalist of Boohwal, a South Korean rock band, until 1989 when he left the band and released his first solo album, "Don't Say Good-Bye" (안녕이라고 말하지마). In 2005 his 7th album, "The Livelong Day", won him Korean Music Awards for best male singer. He has been working as a judge in reality television series "Superstar K". On August 27, 2014, Lee performed "Arirang", "Bridge over Troubled Water" and "The Day" at the opening ceremony of the 65th Annual UN DPI/NGO Conference.