陪你齐肩短发到腰际长发陪你纯真青涩到沉稳安定
[péi nĭ qí jiān duăn fā dào yāo jì zhăng fā péi nĭ chún zhēn qīng sè dào chén wĕn ān dìng]
'Accompanying you from shoulder-length short hair to waist-length hair, from naive innocence to calm maturity'. It conveys dedication and commitment over time—being there as a person grows and changes through different phases of life.