He secretly added aphrodisiacs to the water of his female student, as a personal trainer in a gym full of beautiful girls he interacts with every day, but this male trainer had no affection for anyone. However, when a new female student arrived, he immediately developed feelings for her; the more he interacted with her, the more he felt he loved her. Knowing he couldn't just flirt and seduce her, he secretly slipped aphrodisiacs into her drink to have her in a different way.