I Want to Understand is the thirty-first chapter of Oushitsu Kyoushi Heine manga.
After closing time, the Café Owner asks Licht to create his own blend of coffee for the "coffee of the day". Licht eagerly sets off to impress his boss, but he doesn't seem to like any of his blends, telling him to come up with something original. After an exhausting few days, he still can't come up with anything, until Heine reminds me him that the act of making coffee is always for someone else's benefit. This reminds Licht of the person who he wants to do some for: his hardworking father. At his shift at the café later, Licht presents the owner with his blend, designed to encourage those working hard. The owner accepts it. Later, Licht serves his blend to his father, who thanks him.