Genre: Mystery, Thriller Characters: - Girls; Choi Jisu Shin Yu-na Shin Ryujin Lee Chae-ryeong Hwang Yeji Lalisa Manoban Roseanne Park Jisoo Kim Jennie Kim Moon Byul-yi Kim Yong-sun Jung Whee-in Ahn Hye-jin Kim Dahyun Kwon Eun-bi - Boys; Kim Namjoon Kim Seokjin Min Yoongi Jung Hoseok Park Jimin Kim Taehyung Jeon Jungkook Hwang Hyunjin Han Jisung Bang Christopher Chan Lee Felix Kim Seung-min Lee Min Ho Seo Chang-bin Yang Jeong-in Class A-1 is known as the most popular class in the whole university by having the most perfect students. One of them is hiding the most darkest secret; killing innocent students, framing others and abusing them. The class didn't knew about this until they're getting clues. For starter, who do you think might be behind all of this mess?