长发及腰内是贞子
[zhăng fā jí yāo nèi shì zhēn zi]
Referring to 'having long hair reaching the waist, inside is Sadako'. In Japanese lore, Sadako from 'The Ring' is known for her haunting image and supernatural abilities. This implies mystery with the added twist of potential danger lurking beneath a seemingly gentle exterior due to long flowing hair.