SEPTEMBER 1923 (2023) is based on the historical Great Kantō earthquake of 1923, which resulted in numerous Korean casualties. This film marks the notable feature debut of Mori Tatsuya, formerly recognized for creating documentaries that shed light on various societal issues within Japan.

该剧从宇多田光的两首歌曲汲取灵感：1999 年神曲《First Love》与暌违19年后推出的《初恋》。