1÷x=1+(UNDIVIDED) (stylized as 1÷χ=1+(UNDIVIDED)) is the third extended play by South Korean boy group Wanna One. It was released on June 4, 2018. The EP contains 5 tracks, with 켜줘 (Light) promoted as the title track. The 4 remaining tracks are sub-unit tracks, with well-known artists from South Korea participating in the composition and production.
The first sub-unit of the group, Wanna One - Triple Position, composed of members Daniel, Jaehwan, and Woojin, recorded the track 캥거루 (Kangaroo), produced by rapper/composer ZICO. The second sub-unit, Wanna One - Lean On Me, composed of members Jisung, Sungwoon, and Minhyun, recorded the track 영원+1, with indie rock band NELL producing. 모래시계 (Sandglass), produced by singer/rapper Heize, was recorded by the third sub-unit of the group, Wanna One - The Heal, composed of members Seongwu and Daehwi. The final sub-unit, Wanna One - No.1, composed of members Jihoon, Jinyoung, and Kuanlin, recorded the track 11, with hip-hop duo Dynamic Duo as the producers.
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