Shi Miao is the younger sister in a sibling pair. Her mother left during her childhood, and her father struggles with alcoholism, leading her older brother Shi Fen to become the primary caregiver during their upbringing. This background contributes to her personality traits.

She exhibits a blend of responsibility, maturity, and a practical nature, often serving as the voice of reason in her family. Shi Miao demonstrates strong academic dedication and athletic prowess, with sports being a noted specialty. Her temperament features a quick temper, particularly in response to her brother's frequent teasing and irresponsible behavior, which commonly triggers physical reactions.

Despite her outward frustration with Shi Fen, she possesses a deeply caring and protective nature toward family members. This duality manifests in recurring conflicts where their rivalry surfaces—such as competing for limited resources like restaurant vouchers—yet their underlying bond becomes evident when facing external challenges or reconciling after disputes. Her development includes a gradual recognition of Shi Fen's well-intentioned efforts beneath his recklessness, though their contentious interactions persist.

Shi Miao forms meaningful connections outside her family. She maintains a close friendship with Miaomiao and harbors romantic feelings for Zhen Kaixin, one of Shi Fen's friends. Simultaneously, she attracts attention from Wan Sui, a classmate who admires her. Her social interactions highlight her protective instincts, extending her defense of loved ones beyond family.

Key background elements include a childhood desire for dance lessons misinterpreted as martial arts training by her father. Such experiences, coupled with ongoing familial challenges, shape her resilience and role as both a confrontational sister and a loyal protector.