"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. Originally a retro-influenced doo-wop record composed by both Yoon and songwriter You Hee-yeol, the song was later rearranged by singer-songwriter Henry Lau as part of his collaboration with Yoon Jong-shin for the V Live-exclusive show Snowball Project in 2017. It was eventually given to girl group Red Velvet, who covered and released the song on August 18, 2017, through their label's STATION Season 2 project, becoming the twenty-first digital single for the season and seventy-second overall. It was also the group's second release through the digital project, after "Would U" in April 2017. The song achieved minor success, peaking at number seventy-eight and twenty-five on the Gaon Digital Chart and the Billboard World Digital Songs chart respectively, becoming their lowest charting single on both charts to date.