The duet speaks of the infinite but tragic like involving Chang'e and Houyi, that are based on the Chinese fantasy of your moon goddess, on which the film is based on. Seeing it reminded me of the scene in Singing during the Rain, wherever the audience is in uproar at https://alwaysandforevermine74938.elbloglibre.com/37192037/the-smart-trick-of-always-and-forever-that-nobody-is-discussing