Lee So Young (Jang Nara) life dream is to be a fashion designer but because of family circumstances, she never has chance to attend any class or course in this field. She was blessed with youthful appearances and mistakenly accepted to join a famous design company called The Style as junior designer using her sister's identity. She needs to overcome obstacles from her seniors and rivals to stay in this company.
Choi Jin Wook (Choi Daniel) is a one managing director in The Style and responsible to manage the promotions and sales of all new products. He is the heir of famous restaurant chains business but not interested to work with his father. He always in disagreement term with his father and choose to be independent without his father influences.
His first meeting with Lee So Young was at bar and due to some misunderstanding they are fighting with each other. Then they meet again, this time at The Style and become colleague and later as lover. But their love story is not going smoothly because of big age gap and interference of another man.
Ji Seong Il (Ryu Jin) is the president of The Style. He is a cold man and also a single father.
Kang Yoon Seo (Kim Min Seo) is one of the head team designers in The Style. She graduated from overseas in fashion designing and her name already well-known in fashion industry. She has crushed on Seong Il since a long time and after a few years her feelings to him still the same. However her childhood dream to be his bride might not happen when Seong Il's starts showing interest to Le So Young. Due to jealousy, she tried to do anything to destroy So Young's dreams.