The four high school girls, each of whom has their own personality and appearance, happen to witness the four twins' suicide while preparing for the choir competition.
| Actor | Role |
|---|---|
| HHyun Sook-haengDo Ok-hee | Do Ok-hee |
 Noh SusannaDo Ok-seung | Do Ok-seung |
| JJung HyunDo Ok-ban | Do Ok-ban |
| MMin Se-yeonDo Ok-hye | Do Ok-hye |
 Lee Jong-pilReporter | Reporter |