Sung Jinah

Sung Jinah is Jinwoo's younger sister. Jinah is a slender teenage girl with gray eyes and brownish-black hair that she typically wears in a ponytail. Jinah is a cheery, playful, and diligent girl with a strong sense of family and a close relationship to her brother, as he supported her financially and virtually raised her after their father went missing and their mother fell into a coma. A running gag to her character is her bad habit of hitting Jinwoo with her foot out of irritation only to end up hurting herself due to how durable he is.