Cho Yeo Hwa has been a widow for 15 years. Her in-laws are the most prestigious noble family in the kingdom. During the day, she leads the life of a widow devoted entirely to her dead husband's memory and rarely ventures outside the gate of her home. At night, Yeo Hwa dons the mask of Hero, who secretly jumps over the surrounding wall to save the helpless.

A women with a unique upbringing in a motel in the countryside leaves her hometown at 20 to pursue her career in Seoul. Twelve years later though, she returns home to heal her heart and experiences twists and turns as she reunites with her first love, a now eligible bachelor and veterinarian.

Yong-jun works part-time at his parents' lunch box house. Yeo-reum lives only to support for hearing-imparied swimmer sister. One day, Yong-jun meets Yeo-reum while delivering lunch boxes and falls in love at the first sight. Yeo-reum slowly her heart to warm hearted Yong-jun.