Original source: https://www.jang-keunsuk.jp/notice/release/210903/
On September 4th, ‘Day by day’ Music Video will be available from 20:00, and the making video highlights will be available from 20:30.
*Music Video: https://www.youtube.com/watch?v=L8nXtTbA980
*Making Video highlights: https://www.youtube.com/watch?v=0GZtTrBmDhA