Yu Seohyeon gave up her life to save her first love, Ciel de Leopart, never imagining that death would lead her into an entirely different world. When she opens her eyes again, she finds herself reincarnated as Irene de Closhe, a character living inside a story that feels as though it came directly from a novel.

In this unfamiliar world, Seohyeon is shocked to reunite with Ciel once more. However, he is no longer the same person she remembers. Now, he is a supporting male lead fated to betray the crown prince, and the gentle image she once cherished has been replaced by someone whose piercing gaze carries obsession and madness. At the same time, Seohyeon’s mysterious guide abilities begin to awaken again, pulling her even deeper into the dangerous events surrounding him.

Caught between memories of her past life and the complicated roles they now occupy, Seohyeon must navigate a world filled with political intrigue, hidden emotions, and uncertain loyalties. As old feelings resurface and destiny threatens to repeat itself, she is forced to confront whether the bond between them can survive the collision of past and present.