Dr. Kim Tak works at Korea University's hospital as a doctor and a lecturer. He holds a high position, gives lectures around the country and participates in conferences world-wide. A busy man, he's in the office from Monday to Sunday and always in a rush. Nevertheless, he always wants to learn more, as I come in once a week (or so) to chat so he can practice his English. It just shows how important he makes expanding his knowledge at least a little bit between all of the work and responsibilities he has to tend to.