She is the sweetest among her friends—the kind of person who offers comfort without being asked and listens without judgment. A nursing student and a devoted reader, she moved from her hometown to the city after earning a scholarship, determined to build a better future for herself.

When her professor assigns a research project on human psychology, she struggles to find a unique topic, as most ideas have already been taken. Eventually, she discovers the concept of the red string theory—a myth about invisible threads connecting destined people. Though she knows it isn’t real, her curiosity leads her to explore it further, expanding her research to include different forms of love beyond just romance.

Now in her second year, her life takes an unexpected turn when her favorite character from a novel suddenly dies, leaving her heartbroken enough to stop reading altogether. But just when she thinks she’s moved on, the impossible happens—the very same character is transported into her world.

With no one else to turn to, she takes it upon herself to help him navigate modern life while searching for a way to send him back home, unaware that her connection to him may be far deeper than she ever imagined.