Inspired by real life, this is a story about a few core members of a small language exchange group in a big city. They occasionally appear in various foreign languages. The subject is relaxed and relaxed. The author has already thought about the final destination of the main characters. The foreign languages that appear in the article will be paired with Chinese. Of course, the foreign languages that appear are also limited by the author's own level (and the author's unreliable friends)...