[Bl]Four years ago, Yang Fengbai told Wei Yu that it would take seven days to become his friend. In the early morning of the sixth day, Wei Yu suddenly realized that he could not find Yang Fengbai. The man had left without saying goodbye.
When they met again four years later, Yang Fengbai still told Wei Yu the answer "seven days".
"How long does it take to peek into your heart."
"Seven days."
Concept: Time is eternal