The film lacks explicit depictions of LGBTQ+ identities or non-heteronormative dynamics. The narrative focuses on the protagonist's internal psychology and his bond with his sister.

The story centers on a male protagonist, Xiao Dou, whose arc avoids traditional masculine tropes through his shy and naive nature. Female presence is limited to a familial role.

Set in Beijing, the film depicts a homogeneous ethnic landscape. It provides an authentic look at a specific cultural milieu without seeking to diversify the cast's ethnic composition.

The narrative disrupts moral binaries by focusing on the protagonist's ethically ambiguous obsession with private letters. It favors individual impulse over communal or state-aligned duties.

There is no explicit focus on physical or neurodivergent disabilities. While the protagonist exhibits extreme social anxiety, it is unclear if this is treated with specific agency.