I Saw the Causal Line on the Subway

An ordinary person accidentally sees cause and effect, only to find that his life has already been written into a game by others. The night there was a power outage in the subway, Han Qi saw the lines connecting people. The next day, the woman whom I had seen on the platform last night fell to her death. There was a black line on her body. The news said it was an accident, but the doctor said he was just tired. But retired detective Lao Zhou asked him: "Who does that line point to?" Some deaths do not happen suddenly. They have long been hidden in the line