As part of a new batch of teachers-in-training, young and spirited Yoon Sulhwa returns to Soonbaek Girls' High School with more than simply teaching in mind. Years ago, Sulhwa confessed her love to her teacher, the angelic Chun Jaehee, who still works at the school full-time. Sulhwa's affection was unreciprocated, but discouragement and time have done little to dampen her passion. However, behind Jaehee's grace and warmth lies a secret that exceeds the boundaries of Sulhwa's imagination. Due to the regret that she carries, Jaehee tries to avoid Sulhwa at all costs. She escapes into the sadistic embraces of beautiful and powerful women—one of whom is her boss, Zhu Huilin. These women have the aptitude to hurt Jaehee in all the right ways, bringing her indescribable pleasure through domination, degradation, and even pain. While Jaehee cannot deny her attraction to Sulhwa, the world of BDSM seems overly cruel to introduce to such a wide-eyed girl who may come to hate her for it. [Written by MAL Rewrite]