It is in response to the sentence "I don't know that I am a guest in a dream." Speaking of which, it is unclear whether this is a dream.
When Su Li woke up, she found that the world was no longer the original one. The first thing she saw was the man sitting happily alone by the water playing the piano, and this is how the entanglement in this life began.
When I wake up from a dream, I don't know whether it is true or not. Pengze is leisurely, and the water is gone.