Actress Kim Hieora was originally cast as one of the main roles, but dropped out due to "personal circumstances" shortly before casting was announced.
Based on the Korean webtoon series of the same name.
Both Kim Tae-ri and Moon So-ri starred in two previous projects together: The Handmaiden (2016) and Little Forest (2018), respectively. This makes the second time the duo plays as daughter/mother; first time being in Little Forest.
The design and look of Jeongnyeon, the titular character Kim Tae-ri plays as, were inspired by Nam Sook-hee, the lead character from The Handmaiden (2016)... whom Kim Tae-ri also played as.