Much later, Qi Luoyu learned that in addition to Euclidean geometry, there were also non-Euclidean geometries in the field of geometry. Euclidean geometry tells us that parallel lines never intersect, while non-Euclidean geometry says that two parallel lines will intersect at infinite distance. Today, the scientific community generally believes that the universe is more consistent with the conclusions of non-Euclidean geometry. Therefore, Qi Luoyu thought, if even parallel lines could intersect. Is it possible for people who have been separated to meet again? Never underestimate the power of stubbornness. Because of stubbornness, Qi Luoyu found Gu Ranzhi. Don't underestimate the changing nature of things and people, because some good memories cannot be remembered, and some truths cannot be scrutinized. This time, Qi Luoyu chose to leave. She thought that they should never interact again in this life.