"Rebirth" (Korean: 환생; RR: Hwansaeng) is a song originally written and recorded by South Korean singer and record producer Yoon Jong-shin for his fifth studio album Woo (Stupid) in April 1996.

Together with Yoon Jong-shin and his artist Parc Jae-jung, Henry introduced Snowball Project – a show which "depicts the musical journey" of Parc Jae-jung and NCT's Mark through a special Naver V app video on June 28, 2017.

This resulted in a collaboration between the two artists, titled "Lemonade Love", which was eventually released on July 21 as a digital single through SM Entertainment's STATION season 2.

[3][4] Both Henry and Yoon Jong-shin eventually continued the project with the plan to rearrange their other label's composition into new digital singles, with Henry recruiting Red Velvet and Yoon Jong-shin recruiting PERC%NT, Jang Jane and Giant Pink for the project.

Fellow labelmate Shindong from Super Junior took part in directing the music video, which depicts the members of Red Velvet play the roles of female students whose hearts start to race when their teachers enter the room.