If he has long recognized that his father is guilty, then there is no need to confront his father and kill him directly. The main reason for him not believing his father is that his father said that the person he identified as a child was wrong, and now he is wrong again Now, he believed that he was right when he was a child, but his father still wanted to fool him, which made him feel that his father was unbelievable.
If the father did participate in the killing of the mother, he certainly would not choose to do it in the presence of his son. But why did the father refuse to let the son identify the murderer?
Was it simply because the killer was his friend at the time?
But for the son, no matter whether the father planned to murder the mother or not, the death of the mother was indirectly caused by the father. Taking a ten thousand steps back, he should die if he did not identify the murderer and let the murderer go unpunished.
The last question is that many people are thinking about why the murderer sends red stamps. In fact, it is very simple. This is the truth. As for whether only red stamps are poisonous, strictly speaking, I don’t think so. Red is more beneficial, but I don't think the boy would do this. To be safe, he should have used poison on black stamps, red stamps, and envelopes.
The odds of being caught doing so are rare, as it is not considered a recognized poison. Otherwise, if the letter is not sent back immediately (the murderer can put the envelope number and stamp on it first, and wait for someone to collect it), then even if you only use the red stamp, you will still be discovered.
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