Li Mo's grandmother inhabits a traditional Shanghai shikumen residence. This home safeguards artifacts from Li Mo's childhood, notably cassette tapes exchanged with Xiao Yu. Her residence anchors Li Mo, offering a tangible link to revisit his past.

During adulthood, Li Mo returns to this house specifically to find a tape recorder needed to play an old cassette from Xiao Yu. His grandmother enables this retrieval, providing access to these childhood objects, though she remains absent from flashbacks and present-day interactions beyond facilitating access. Her home holds the tangible fragments of Li Mo's youth.

The character maintains the physical space preserving Li Mo's childhood memories, especially the pivotal cassette revealing Xiao Yu's sacrifice and feelings. Her role centers on the preservation of these objects, not direct emotional guidance or participation in narrative events. She exists primarily as the custodian of the environment holding Li Mo's key childhood artifacts.