As per reports from media sources on March 27 KST, a tribute song honoring the late ASTRO member Moonbin will be coming out in April. The project saw the participation of Moonbin's nearest and dearest, including group members Cha Eun Woo, MJ, Jinjin, and Sanha, his sister Moon Sua, and friends like Seventeen's Seungkwan and DK, VIVIZ's SinB, among others.

Last year, on the anniversary of Moonbin's passing, ASTRO's Jinjin released a special single titled "Fly" (featuring Moonbin). Seungkwan from Seventeen also put out the single "Dandelion", while Cha Eun Woo presented a cover of 10cm's "Stalker" as their personal tributes to Moonbin.

This year, the ASTRO members took the initiative to unite Moonbin's close friends for this new project, with the commemorative single set for an April release.