Part 1

"A nineteen-year-old living alone?" Arum, Daun, Uri, Nara, the famous quadruplets of the neighborhood. A girl named Yeoreum moves in next door to the quadruplets. But this girl. She has no parents and is all alone. She also has an extremely prickly personality. Yeoreum distances herself from the kind neighbors and builds walls. Arum, Daun, Uri, start to care about such Yeoreum...