engineer, all instruments and computer programming (on "TT (Tak Remix)") Choi Ja-yeon – assistant mixing engineer Park Jeong-eon – mastering engineer Chris Gehringer – mastering engineer Dave Kutch – mastering engineer Will Quinnell – assistant mastering engineer Kim Young-jo (Naive Creative Production) – music video director Yoo Seung-woo (Naive Creative Production) – music video director Kim Young-joon (Agency Seed) – photographer Choi Hee-seon – style director Im Ji-hyeon – style director Park Nae-joo – hair director Won Jeong-yo – makeup director Kim Hyeong-woong – choreographer Yoon Hee-so – choreographer Lee Ji-hyeon – choreographer Jiggy Choi Young-joon – choreographer Today Art – printing Jowul – vocal production (on "Ice Cream") Choi Han-sol – computer programming (on "Ice Cream") Pink Hound – computer programming (on "Ice Cream") Jeong Jae-pil – guitar (on "Ice Cream") Lee Jeong-woo – bass (on "Ice Cream") Son Min-kyeong – background vocals (on "Ice Cream") Jeong Yoo-ri (CaSSeTTe08) – additional engineering (on "Ice Cream") Rado – all instruments and computer programming (on "TT", "Like Ooh-Ahh (Inst.)", "Cheer Up (Inst.)" and "TT (Inst.)") Jihyo – background vocals (on "TT") Nayeon – background vocals (on "TT") Noday – all instruments, keyboard and computer programming (on "1 to 10") Chloe – all instruments, keyboard, computer programming and background vocals (on "1 to 10") Kwon Phillip – guitar (on "1 to 10") Yoon Woo-seon – piano (on "Ponytail") Kim Ki-wook – bass (on "Ponytail") Hong Joon-ho – guitar (on "Ponytail") Lee Gyu-hyeong – drum (on "Ponytail") Lee Dae-hee – synthesizer (on "Ponytail") Kim So-hyeon – chorus (on "Ponytail") and background vocals (on "Pit-a-Pat") east4A – all instruments and computer programming (on "Jelly Jelly") Jeong Jin-ha – background vocals (on "Jelly Jelly") Im Kwang-wook – all instruments and computer programming (on "Pit-a-Pat") Kang Ji-won – all instruments and computer programming (on "Pit-a-Pat") Joe J. Lee "Kairos" – all instruments and vocal production (on "Next Page") Hobyn "K.O" Yi – all instruments, keyboards, computer programming and vocal production (on "Next Page") Samuel J Lee – bass and vocal production (on "Next Page") Esther Park "Legaci" – background vocals and vocal production (on "Next Page") Bei Zhang – background vocals (on "Next Page") Wes Kosakowski – additional engineering (on "Next Page") Sebastian Thott – all instruments, computer programming and guitars (on "One in a Million") Andreas Öberg – guitars (on "One in a Million") Lee Da-jeong – background vocals (on "One in a Million") Charts