Joo-hyun (Irene) is a highschool student that always fail, fail, and fail (fail her exam, fail in helping her mother in the bakery, fail in getting a lovelife, etc.). Along with her friends, Seol-rim (Seulgi), Seung-wan (Wendy), Sooyoung (Joy), and Se-rim (Yeri), they go to a vacation to spend their summer together but during the trip, an old woman approach them and said that one of them is cursed. And she pointed out Joo-hyun. Due to that incident, they tried to figure out what is Joo-hyun's problem. Then they noticed that Joo-hyun's name was the only one that starts with J (because all of them starts with S.). So after that, they decide to change Joo-hyun's name (to Sae-rin, but it doens't affect after all.). The problem just become worst. A boyband that is called B1A4, was trying to find a girl named Sae-rin, which they think she is Joo-hyun (due to her changed name). How will Joo-hyun and her friends solve the problems that they started?

 Do not plagiarise. (PLAGIARISM IS A CRIME.)