vocals Daniel "Obi" Kleincomposition , arrangement Andreas Öbergcomposition , guitar Tania Dokocomposition Maribellecomposition MinGtioncomposition , arrangement , piano , bass Andrew Choicomposition Joseph Hongcomposition , arrangement Jae Shimcomposition Krizbackground vocals Seo Mi-raebackground vocals Technical Yoo Young-jindirecting , recording , digital editing , mixing engineer , mixing Kenziedirecting ButterFlyvocal directing , Pro Tools operation , digital editing Kim Yeon-seodirecting Krizvocal directing Jeong Eui-seokrecording , mixing Noh Min-jirecording , mixing engineer Kim Cheol-soonrecording , mixing Lee Ji-hongrecording , digital editing , mixing engineer , mixing Jung Yoo-radigital editing Lee Min-kyudigital editing , mixing engineer , mixing MinGtiondigital editing Namkoong Jinmixing Cheon Hoonmastering Kwon Nam-woomastering Charts Weekly charts Monthly charts Year-end charts Certifications and sales Release history References 2020 debut EPs Red Velvet (group) EPs SM Entertainment EPs Korean-language EPs IRiver EPs