Before his father disappeared, he warned: "If you hear me calling you, don't agree." Wu Liang didn't believe in these old Northeastern rules. He just wanted to use a recording device to find his father. Until he recorded a piece of Morse code in an abandoned mine - after decoding, it was "sealed above", and the date of transmission was three days later.
The boiler room in Shuangya Mountain, the village under the ice in Jingbo Lake, the reverse train in Daxinganling... There is a rule hidden in every ruin: if you can hear the past, the past can grasp the present. When Wu Liang finally answered the voice that had been calling for thirty years, he discovered that there was a word hidden in the background noise of all recordings that he had never spoken but had been recorded for twenty years.
Those were not last words, but a receipt. And he had already signed it.
