On June 20, 2013, Yang Hyun-suk announced Seungyoon would be debuting as a solo artist with the single "Wild and Young" composed by Teddy Park.
On July 15, it was announced Seungyoon's debut would be postponed.
However, the following day another single titled "It Rains" was released instead.

"It Rains" achieved an all-kill by placing at number one on all nine major real-time charts in Korea.
On July 31, "Wild and Young" was released with two more title tracks set to be promoted in August and September.
Live promotions of the single commenced on August 4 on Inkigayo.
On August 14, Seungyoon's second single "Stealer" (Korean: 맘도둑) was released.
The music video, starring rookie actress Yoon Jin-yi, was "filmed secretly" and released without promotions so as not to disrupt the promotions for "Wild and Young".

Seungyoon then participated in the survival reality program WIN: Who Is Next.
The program would involve two teams of YG trainees (A and B) that would compete against each other for the chance to debut at the end of the series.
In the seventh episode of WIN: Who Is Next, Seungyoon replaced bandmate Song Min-ho as the leader of "Team A".
On October 25, it was announced that Team A had won the series and would debut as Winner.
The group performed as the opening act of Big Bang's Japan Dome Tour which started on November 15, and made their own official debut on August 12, 2014.
The same year, Seungyoon and fellow member Song Min-ho participated in Yoon Jong-shin's Monthly project and released the song "Wild Boy".
On June 20, 2013, Yang Hyun-suk announced Seungyoon would be debuting as a solo artist with the single "Wild and Young" composed by Teddy Park. On July 15, it was announced Seungyoon's debut would be postponed. However, the following day another single titled "It Rains" was released instead.
"It Rains" achieved an all-kill by placing at number one on all nine major real-time charts in Korea. On July 31, "Wild and Young" was released with two more title tracks set to be promoted in August and September. Live promotions of the single commenced on August 4 on Inkigayo. On August 14, Seungyoon's second single "Stealer" (Korean: 맘도둑) was released. The music video, starring rookie actress Yoon Jin-yi, was "filmed secretly" and released without promotions so as not to disrupt the promotions for "Wild and Young".
Seungyoon then participated in the survival reality program WIN: Who Is Next. The program would involve two teams of YG trainees (A and B) that would compete against each other for the chance to debut at the end of the series. In the seventh episode of WIN: Who Is Next, Seungyoon replaced bandmate Song Min-ho as the leader of "Team A". On October 25, it was announced that Team A had won the series and would debut as Winner. The group performed as the opening act of Big Bang's Japan Dome Tour which started on November 15, and made their own official debut on August 12, 2014. The same year, Seungyoon and fellow member Song Min-ho participated in Yoon Jong-shin's Monthly project and released the song "Wild Boy".
Kang Seung-yoon