A girl Eun-chan with childish behavior struggles to find several jobs to meet her needs, while a wealthy woman plans to put the girl in the path of her spoiled grandson in an attempt to change his behavior.
Eun-chan agrees to act as Han-kyul's fake girlfriend to get rid of the dates that his grandmother is planning for him, but Han thinks that Eun is a man and buys her suits to be elegant.
Eun loses her job at the Taekwondo Education Center and is only left with part-time work in the toy factory. She convinces Han to manage his grandmother's café so that she can work with him there.
Work begins in the café on the opening day, and the workers imagine that the future will be good for the small café, but tension begins to arise between Eun and Han.
Han discusses with his father the possibility of establishing a café, in addition to his disagreements with Eun that are getting worse, especially after Min Yeom leaves work.
Han discovers the truth about the beginning of his interest in Eun, so he invites her to Yoo-joo's exhibition to find out her identity. Eun feels jealous of Yoo-joo because of her achievements in life.
Eun gets angry at Han's bad treatment of her, so she decides to leave her work, which greatly affects the café, so they both think of a solution to return things to the way they were.
Han is saddened by the news he receives about his grandmother's poor health and, at the same time, tries to figure out what to do about his feelings for Eun.
Han and Eun begin to be convinced of their new relationship as brothers, but as time passes, Han realizes that this is not enough and aspires to change their relationship.
The tension continues in the relationship between Han-sung and Yoo-joo and between Han and Eun. Han announces his travel plans, which saddens Eun even more.
Eun finally reveals to Han the truth that she is a girl, which affects the entire café and turns things upside down.
Eun-chan dreams of Han seeing her as a girl and falling in love with her, while Han finds himself discussing his relationship with Eun with Han-sung.
Eun-chan talks to her mother and sister about her relationship with Han and reveals her dream of traveling with him, which is met with rejection from them, leading to thinking about a compromise.
Han reveals Eun's true identity to his mother and grandmother, but they do not like her appearance and believe that she is the reason he gave up the opportunity to travel to America, which causes problems to arise between Han and Eun.
The discussion of Han and Eun's marriage disrupts Yoo-joo's happy day and leaves them confused about the reality of their relationship.
Because they don't think their love is strong enough for marriage, Han and Eun argue about the concept of getting married. However, his grandmother debates with the family whether Eun is deserving of Han, the heir to their long-standing business, or not.
Eun decides to leave work at the café to travel and study in Italy, which saddens everyone in the café because the fun atmosphere disappears with her departure. On the other hand, Han seeks to make their relationship a success despite the distance between them.