Now, Episode 40... I need to remember the key events of that specific episode. Let me think. The series reaches a point where the main characters face consequences for their actions. There's the student, Min-hye, and the teacher, Oh-jin. Their relationship is causing problems, especially in the school. Maybe in episode 40, there's a conflict escalation, like a confrontation between the two, or perhaps the school administration gets involved. Or maybe external factors, like parents or other students start to notice the issues.