A pure love drama depicting a secret 10-year physical relationship that no one could know—your first love was actually your homeroom teacher. While continuing their hidden affair at school, they repeatedly engage in platonic sex. After graduation, they reunite at a class reunion, reigniting their passion. Their intense desire for each other is vividly portrayed as they passionately seek one another in a hotel. Even after marriage, her feelings for the teacher never fade, evoking a sense of endless longing in this forbidden romance.