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. However, she soon starts to wonder if her mother's intentions are genuine after an incident with her affluent grandfather.

After a humiliating incident at her new school, Da Mi faints in front of Chil Sung's house. Meanwhile, Monet attracts the attention of multiple entertainment agencies after a stunning audition, including La Hui. However, a rumor surfaces online that could potentially destroy everything she has worked for.

Da Mi leaves La Hui and promises she won't let her receive any money from her grandfather. Meanwhile, Scarlet Letter spreads rumors of Da Mi and her stepfather's promiscuous relationship, causing widespread outrage and chaos. To make things right, Da Mi takes things into her own hands and calls everyone to the park.

Da Mi disappears as she broadcasts getting shot live over the Internet, and the person taking the fall is her adoptive father, Lee Hwi So. The people involved get entangled in twisted turmoil while the police search for Da Mi's body. Meanwhile, Bang Chil Sung steps in to find the truth.

Lee Hwi So gets the death sentence for the murder of Da Mi and Chil Sung. Miraculously, Bang Chil Sung survives the fall and works with Kang Ki Tak to secretly help Hwi So get out of prison so he can avenge Da Mi's death. Meanwhile, Monet becomes a big star and prepares a special party on Jeju Island to which only 33 winners are invited.

After encountering peril and beating death, the seven people who managed to escape the island alive struggle to stay out of facing trouble with the law. However, all seven of them find a threatening message in their rooms that shocks them. Meanwhile, Matthew Lee appears just in the nick of time to help the seven survivors with the police investigation.