Cheng Hao accidentally discovered that his wife had an old mobile phone that he had never mentioned before. It only contained encrypted text messages with an unknown number, and the content was about "cargo delivery" and "personnel evacuation." He used his professional skills to crack it and was surprised to find that the "cargo" was actually their three-year-old son. The sending pattern of text messages shows that the location where the other party receives instructions every time is near his company's confidential project laboratory.
