Kang Seung-yoon, also known mononymously as Seungyoon or Yoon, is a South Korean singer-songwriter, actor, and leader of boy band Winner. His appearance on the reality television singing contest Superstar K2 (2010) rose him to prominence after finishing in fourth place. The digital single "Instinctively", became his first number-one single as a soloist and neared 2 million digital copies in sales. On January 12, 2011, he signed with South Korean label YG Entertainment and officially debuted as a solo artist on July 16, 2013, with the digital single "It Rains" and as the leader of Winner on August 17, 2014.

Winner is a South Korean boy band consisting of four members: Jinu, Hoony, Mino and Seungyoon. The band was formed in 2013 by YG Entertainment through Mnet's survival program WIN: Who Is Next leading to their official debut on August 17, 2014, with studio album 2014 S/S. Originally a five-piece band, Taehyun departed in November 2016 for his mental health and well-being. Upon their debut, The Korea Herald cited their immediate success as "unprecedented" for a new group, thus dubbed as "Monster rookies". Winner is often cited as a "self-producing" band with all members actively taking on roles from producing and choreographing to designing and marketing. The band also earned the titles "Trust and Listen" alongside "Kings of Summer" by media outlets and the general public through releases.