The INTJ personality type accounts for approximately one percent of the population. Appearing cold and introverted on the outside, they are rigorous in thinking and resourceful, and are not disturbed by criticism and indifference. They are the most independent of the sixteen personalities. Both the male and female characters in this article have INTJ personalities. The female protagonist changes jobs and returns to her hometown to work. The male protagonist is her boss. The two have a lot of interactions because they live very close to each other and become each other's friends. The male protagonist lives like a retired man, and the female protagonist, an older young woman, lives like a primary school student. The age difference is ten years. In short, the collision of two icebergs.