After serving his military duty, Junghoon, who has never had a girlfriend, returns to college. He has a secret crush on Eunji, a member of the school’s paranormal activity research club called Mysteria, in which he also belongs. One day, Junghoon meets Jisun, a virgin ghost, by chance, and Jisun asks him for help with her Scare tests, the exams that she needs to pass in order to be reborn. In return, Junghoon makes an arrangement with Jisun to help him score points with Eunji. While trying to help each other’s problems, the two run into disagreements, but their feelings for each other grow deeper as time passes.