Shy and unpopular Dasom Park rushes to meet her only friend, the beautiful and adored, Iseul Chae. Instead, she finds Iseul's dead body, or rather, its hollow shell. Dasom enters it and takes over Iseul's seemingly perfect life. But as Dasom discovers horrific family secrets, she wonders where her friend went, and if it was an accident she ended up in Iseul's shell.
Dakyung Lee, an elite member of a criminal organization, learns of the death of her beloved boss. Upon discovering that Chairman Lee was behind it, she vows to take revenge. Yet, since he’s protected by the Sa Yeong Group, all her attempts appear futile. Just as Dakyung is about to give up, she uncovers details about the chairman’s son. In a final bid for revenge, she infiltrates his son’s school, Chaebol High School.
Lenny, a young French student, arrives in Montreal to pursue his journalism studies. As part of a class assignment, he meets Anoki, a quiet Algonquin student, and the two are paired up as a team. Their investigation soon draws them into a mysterious monster hunt. Caught between myths and legends and possible deception, the two boys challenge each other’s beliefs and gradually form a deep bond. But what will happen when they are forced to share their secret?
After graduating from the Korean National Police University and becoming a detective, Jiyong is assigned to investigate a suspicious report and comes face-to-face with a nationwide jeonse scam. As he confronts criminals who slip through the cracks of the legal system without proper punishment, Jiyong begins to question the rules of vigilante justice he once set for himself. While pursuing the scam’s ringleaders, the four vigilantes receive a threat from someone who knows their true identities and begin to sense the looming presence of a far greater evil. This series contains depictions of mature content that may not be suitable for some readers. Viewer discretion is advised.