In exchange for magical favors, debts are given to the receiver in the form of black beads. Seven years ago, Yeri gathered enough black beads to fill her whole entire left arm. Now, Jungkook, with a chaste kiss and mischievous smile, is finally ready to collect his debts.  

  chaeyoung is an inspiring musician who dreams of starry concerts, but, at the same time, is afraid of leaving the protection of her home. sooyoung likes emitting joy with her bubbly smile; however, sometimes, she wants to be selfish and smile for herself.  nayeon can't control her resting face or her problematic parents, so she resorts to controlling men. jisoo is an organized perfectionist who likes her waffles, bed, and bo