Seo Eun, a stylist nearing thirty, faces personal and professional setbacks, including a breakup and an unexpected connection with Jogging Man.

Seo-eun strives to act more mature, but her feelings become complicated when she encounters Jogging Man, a man who stirs up both admiration and jealousy in her.

Seo-eun, returning home for her mother’s 60th birthday, finds herself caught between her parents' conflicting plans while facing pressure about her own marital status.

Seo-eun navigates emotional turmoil as she lets go of her troubled relationship with Kang-sik, only to sense an unsettling presence following her.

As she approaches thirty, Seo-eun briefly experiences hope with unexpected good fortune, only to face a sudden cascade of misfortunes that turn her life upside down.