Who Called Me Mengxian?

My master travels around the world by interpreting dreams. Everyone respects him as "Dream Fairy" and politely calls me "Little Dream Fairy". However, he never taught me anything to do with dream interpretation. Until one day, the master disappeared inexplicably. I searched all over the world for him, but couldn't find him anywhere. Until Uncle Yang told me before he died, Yang An, life is just a big dream, let the past go. Master, how should we interpret this dream in life?