H1-KEY - Summer Was You (여름이었다)

H1-KEY - Thinkin' About You

H1-KEY - Let It Burn (뜨거워지자)

H1-KEY - ♥ Letter

H1-KEY - Let Me Be Your Sea (내 이름이 바다였으면 해)

H1-KEY - One, Two, Three, Four

H1-KEY - Rose Blossom (건물 사이에 피어난 장미)

H1-KEY - ATHLETIC GIRL

H1-KEY - Catch 'n' Release

H1-KEY - Crown Jewel

H1-KEY - Good for You

H1-KEY - Iconic

H1-KEY - Magical Dream

H1-KEY - SEOUL (Such a Beautiful City)

H1-KEY - Danger

H1-KEY - Deeper (기뻐)

H1-KEY - Dream Trip

H1-KEY - Heart Light

H1-KEY - Low-key Scared But H1-KEY Ready

H1-KEY - Rainfalls

H1-KEY - Re: Thinkin' About You (feat. Josh Cullen)

H1-KEY - Ring the Alarm

H1-KEY - RUN

H1-KEY - Time To Shine (Instrumental)

H1-KEY - Time To Shine (불빛을 꺼뜨리지 마)

H1-KEY - You Are My Key