As a widow, Yeo Hwa cannot leave her home and has to mourn her late husband day and night. However, she often sneaks out at night and helps people in trouble by disguising herself as a man behind a black mask. One day, she hears that Ggotnim, the little servant she adores, was taken for her father's debts. She goes to the inn where Ggotnim is and sees Officer Park trying to take her by force.