[1] The series features an ensemble cast headed by Yuki Kato as Alissa, Anya Geraldine as Hanna, Eyka Farhana/Caitlin Halderman as Ema, Valerie Thomas as Sabrina, and Shindy Huang as Aria.

[2] The series also features Wulan Guritno, Tarra Budiman, Naufal Samudra, Jennifer Coppen, Cindy Nirmala, Giulio Parengkuan, Bio One, and Bastian Steel in starring roles.

Set in the fictional town of Amerta, Bali, it follows the lives of four female college students whose clique falls apart when their leader, Alissa, goes mysteriously missing in the night of their high school graduation.

One year later, Hanna, Ema, Sabrina and Aria find themselves reunited when they begin to receive messages from a mysterious figure known as "A", who threatens to expose their darkest secrets.

[6] Along with the series' announcement, it wasannounced that Anya Geraldine, Eyka Farhana, Valerie Thomas, and Shindy Huang are set to play the main characters Hanna, Ema, Sabrina, and Aria.