A text message from an unknown number
"Stay away from people holding black umbrellas, the further away the better."
Bai Chi stretched out his hand within the shelter of the black umbrella, and red rainwater flowed down his fingertips.
"Now I know who you are."
On the day after the college entrance examination, Bai Chi received an inexplicable text message. He didn't take it seriously at first, until a rainy day a few weeks later, he stood in the red rainstorm, helpless.
At this time, a black umbrella was handed over.