START-UP OST
- 미래 (Future) by Red Velvet
- 혼잣말 (To Me) by Jeong Eun Ji (정은지)
- 날 사랑한 처음의 너로 돌아와 (Love Me Like You Used To) by Kassy (케이시)
- My Dear Love by Suzy (수지)
- 상상한 꿈 (Dream) by JAMIE (제이미)
- Two Letters by WENDY (Red Velvet)
- 어른 일기 (Lonesome Diary) by Sandeul
- Blue Bird by Ailee
- 우연히 잠시라도 (Even for a Moment) by CHEEZE (치즈)
- My Love by DAVICHI
- Where Is Dream by 10CM
- 어느 날 우리 (One Day) by Kim Feel
- 두 글자 (Two Words) [Instrumental] by WENDY (Red Velvet)