Kim Dae Hyun is an orphan since young. He was adopted by a volunteer at the orphanage, so he is still living in it. After his Middle School Leaving Examination, his guardian, Mother Soo Yoon, allowed him to move out of the orphanage. He spent his whole day searching for dorms when he stumbled upon a large bungalow shared by 18 girls who called themselves AOAPink Day. After moving in, he realised that they will be in the same high school as him. How will his relationship with the girls progress throughout the year? Read to find out!