Summary:

Yang sold all his possessions and boarded the interstellar funeral spaceship with two violins, which would carry him deep into the universe until the life support system and fuel ran out and the ship would become a moving tombstone in the universe. The spaceship sails to the farthest planet in human society, the Sibelius, where it will stay for seven days, and the people on board can choose to return to Earth during these seven days. During the seven days, many strange things happen, and people keep choosing to return, but Yang is still determined to stay, until he finds that his dead lover who left him ten years ago seems to have come back to life on this planet.