Swim in U – Is there equation in Love OST Pt. 1 Released: 2021/10/4 Genre: Films/Games & Film Scores TRACK LIST: 01. Question mark(You+I=?) (feat. Jung ha Hwang) 02. Yes or No (feat. Huski) 03. Question mark(You+I=?) Instrumental 04. Yes or No Instrumental MP3-320K . .