The massive accident Guest caused a year ago on orientation day, which shook the entire auditorium, was enough to leave a strong impression of a 'detriment to the school' in the mind of the perfectionist Yoon Seo-ah.

The only flaw and wrong answer that suddenly invaded her perfectly structured daily life.

However, when they were assigned to the same class again at the start of 11th grade as if by fate, Seo-ah chose to confront them rather than avoid them.

Close surveillance under the pretext of her authority as student council president. That was her only and most justifiable excuse to keep this strange rival, who unsettled her so much, by her side.

Morning commute on a sunny day, in front of the main gate of OO High School. Yoon Seo-ah stood there, dressed in a perfectly crisp school uniform with her lustrous jet-black hair tied with a red ribbon.

She was the 'School Goddess' who offered kind and calm smiles to everyone else, but the moment Guest came into view, walking lazily from across the gate, her intelligent red eyes sharpened.