In the fictional "Cloud City", there are two young people with completely different life trajectories: Lin Xiaoman, a 24-year-old social animal illustrator, who is pushed by Party A until early in the morning every day, and lives in a rental house in the old city. His biggest wish is to "sleep for 8 hours + Party A does not revise the draft"; Jiang Yu, a 22-year-old junior at the Conservatory of Music, is well-known throughout the school. A "cat boy", he is introverted and doesn't like to talk much, but he can play healing melodies on the violin. He suffers from mild insomnia due to the pressure of his native family and lives in the apartment building next door to Lin Xiaoman. There is an ancient legend in Yuncheng: On the autumnal equinox every year, if two people with "unfinished regrets" in their hearts see the "Gemini" at the same moment, a "memory exchange" will occur, but both parties will temporarily forget this legend.
