Reinthea, a modern girl, dies in an accident and wakes up as Seraphina, the villain in a royal novel. In the original story, Seraphina was notoriously arrogant, cruel, and ultimately sentenced to death.

To make matters worse, she has been bound by a political marriage to Prince Lucian Ardelion Vaelcrest, the king's second son, but far more competent than the crown prince. Raised as a knight and statesman. Never desired a political marriage. Viewed the original (evil) Seraphina as a threat to the kingdom's stability, a cold man who disliked her.

Realizing Seraphina's plight, the girl tries to change: she begins making good decisions, avoiding conflict, and repairing her reputation. However, these changes make people suspicious. Meanwhile, Lucian observes Seraphina's transformation from afar—not with romance, but with wariness and confusion.

Reinthea's goal is simple: avoid the tragic end that awaits her and determine her own destiny.