Lin Ling, an ordinary college graduate, was almost involved in a dangerous supernatural incident two years ago. With the help of a mysterious old man, he successfully saved the day. After graduation, Lin Ling came to work in a relevant department of a secret unit by chance. While sorting out a batch of top-secret files that were lost decades ago, Lin Ling once again met the old man who had the grace to save his life, and thus opened up a long-lasting past that happened in the relevant department in the 1960s and 1970s...
