Being the middle child among three girls did not make Choi Hanni feel alone or lonely in any way. She grew up as a sweet girl, given that everything she wanted was with her - a complete family, great friends, and a good life.

                               Her older sister, Choi Jin Ri, is a very cheerful person and somewhat vain, always thinking about what to wear and what hair and make-up would match these. She loves dressing up, not only herself but also her two younger sisters Hanni and Jessica. It is unquestionable for her to be so finishing fashion design, she uses her siblings as models for her very own clothing line.

                              On the other hand, Choi Jessica, the youngest among the siblings, treats her sisters as role models. Showing the sweet attitude she has, she keeps talking about how much she likes to be a fashionista like Jin Ri, keeping herself cool and happy-go-lucky at the same time, just like Hanni.

                               Having such busy parents, Choi siblings are often left home alone. Same goes for the heir of the Kim Group of Companies, Kim Hee Chul. Since the Choi’s and the Kim’s are very close, their children grew up together treating each other as siblings.

                               Hee Chul is closest to Hanni as if they are of the same age. Hanni finding an elder brother, and Hee Chul finding himself a younger sister he needs to take care of. Hee Chul, fulfilling his role as a good brother, is always there whenever Hanni needs him; always ready, a caring shoulder to cry on.

                                The story as a whole revolves around the relationship of the Choi’s and the Kim’s - how new characters will affect their lives and which things would change under certain circumstances.