Da-mi, a young high school student with a heart condition, leaves her adoptive parents to live with Geum La-hui, her biological mother; when Da-mi arrives at La-hui's place, she is overwhelmed by her riches.

After a humiliating incident at her new school, Da-mi faints in front of Chil-sung's house; Monet attracts multiple entertainment agencies' attention after a stunning audition, including La Hui.

Da-mi leaves La Hui, vowing to block inheritance; Scarlet Letter spreads rumors of Da-mi's improper relationship with stepfather, causing outrage.

Da-mi vanishes after livestreaming her shooting, with her adoptive father Lee Hwi-so taking the blame; those involved face turmoil as police search for Da-mi's body.

Lee Hwi-so gets a death sentence for Da-mi and Chil-sung's murders; Bang Chil-sung survives the fall and works with Kang Ki-tak to help Hwi-so escape prison to avenge Da-mi's death.

After encountering peril and beating death, the seven people who managed to escape the island alive struggle to stay out of trouble with the law; all seven find a threatening message in their rooms that shocks them.