This drama revolves around a woman who has a chance to rise in status but falls into a bottomless pit, and eventually finds a chance to seek happiness. It also involves a man who tries to find happiness in her.
25 years ago, Haesung group lost their grand daughter Choi Eun Seok. The girl was found and raised by Seo Tae Soo as one of his twin daughters Seo Ji Ahn and Seo Ji Soo, They grew up rich but their father bankrupted and they had to experience the hard life of a dirt spoon. Ji Ahn now is a contract worker at Haesung group who would do anything for a job while Ji Soo is an air headed part timer who has a one sided crush on Sun Woo Hyuk, Unknown to her that Woo Hyuk was in love with Ji Ahn in high school. Choi Do Kyung is Haesung Group oldest grand son, he is gentle and kind but being too good yet still single makes his employees spread weird rumors about him, he meets Ji Ahn in a car accident and comes to know her sad situation but his biggest shock is when his mother reveals that his lost sister is Ji Ahn.
Park Si-hoo as Choi Do-kyung He is the only heir to Haeseong Group and the head of Strategic Planning Team. He is a third generation chaebol who has returned from the USA after finishing his MBA. He is a gentleman with admirable physique and elegance. He takes pride in the fact that he practices Noblesse Oblige unlike other chaebols who like to power trip. When the "perpetrator" of an accident involving his car, Seo Ji-An, is later revealed to be his younger sister, 'Choi Eunseok,' his life takes a new turn.
Shin Hye-sun as Seo Ji-An She is on a probationary two-year contract with the marketing team of Haeseong Group. Before her father went bankrupt 10 years ago, she used to be the original 'girl crush.' Everyone admires her competitive spirit and cheerful personality. Now she only dreams of being a full-time employee of the Haeseong Group. When that dream is shattered by a friend with wealth and connections, she hits rock bottom. Then, like a miracle, she gets a chance to reverse her life as the daughter of Haeseong Group. She chooses to take the silver spoon and live a glamorous life. But unexpected challenges are waiting for her.
Lee Tae-hwan as Sunwoo Hyuk He is Ji-An’s high school friend. With a major in interior design, he runs a DIY furniture shopping mall. He has a cheerful and feisty personality, but he also has a cranky side and his likes and dislike are very clear. Ever since he fell in love with Ji-An at first sight in high school, he has had a crush on her. He does not realize that Ji-Soo, who has a crush on him, is Ji-An’s twin sister.
Seo Eun-soo as Seo Ji-Soo Ji-An’s twin sister; After graduating from vocational college, she has been making a living as a part-timer for years. She is without a worry in the world. Since she loves bread so much, she gets a job at a local bakery. Without knowing the relationship between Ji-An and Sunwoo, she has a secret crush on Sunwoo. When her twin sister enters the chaebol family, she learns the secret behind her birth and becomes confused.