Summer 2016 After Sooyun turned 19 years, she and her cousin Yoonli left Seoul to start living is New York. Two years pass and Yoonli and Sooyun went back to Seoul to visit their friend, Nomi. The little they knew that the famous rookie group BTS lived in the same building. One of their favorite k-pop groups lived right in front of Nomi's house. What could happen in just 3 months?   Characters: Kim YoonLi