It's not a coincidence, it's not an accident. When deliberateness is the only thing left, Xu Siran thought that he could always live in a dream. The words in the dream "Hello, who are you?"
But when I woke up from the dream, I didn't know what was left in me at the end. What's left may be a text message, a phone call, a string of memories, and a person from the past.