Where did Wu Can Xiaomei and Wang Xiaolei learn that the murderer was her husband?

The sign on the wooden box. Wu Xiaomei and Wang Xiaolei is a puzzle game. In the game setting of the game, in the sixth pass, we can find that the woman was killed by an acquaintance. On the sign on the wooden box in the room, we can see that the murderer is her husband. The brand is the key evidence left by the woman, the evidence that the deceased tore off her husband before being killed by the murderer, and it was thrown into the box so as not to be found.