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.
Park Sae-byul Park Saebyul (; born October 24, 1985) is a South Korean indie singer-songwriter.