待我长发及腰成贞子
[dài wŏ zhăng fā jí yāo chéng zhēn zi]
'When my hair grows down to my waist, I’ll become like Sadako (Kayako).' A reference to Japanese horror films such as 'Ring' or 'Ju-on' with characters Sadako Yamamura/Kayako Saeki whose flowing black hair covered their face as an ominous sign before terrifying incidents. It conveys transformation into darkness or mystery associated with female spirits.