The story follows a character who grapples with the frustration of having an older sister who appears significantly younger than her. This situation leads to feelings of insecurity and jealousy as she tries to understand why her sister seems to defy aging.

As the narrative unfolds, the character uncovers the reasons behind her sister's youthful appearance, such as skincare routines, lifestyle choices, and perhaps a more carefree attitude toward life. Through this journey, she reflects on her own habits and self-image.