The snake eyebrow of Tongyu is actually a symbol of Wang Zanghai. Wang Zanghai hid the Jurchen characters in the fish pattern by carving technology. The fish pattern recorded the process of building a mausoleum for the Jurchen emperor, and the key content was the truth of the slave king he discovered-a monster from underground.
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Tong Yu's secret is the secret of Zhang's longevity, so many people want it.
Wang Zanghai knew the secret of the Zhang family's longevity and that his time was running out, so he left all the secrets on Tong Yu with snake eyebrows, hoping that the Wangs could know the secret through Tong Yu with snake eyebrows in the future.
The descendants of the Wangs didn't live up to Wang Zanghai's expectations, but what they didn't expect was that this was Wu Xie's plan to find the snake-browed child feather.
There are three snake eyebrows communicating with the universe in the book "Notes on Grave Robbery", which were placed by Wang Zanghai in the three feng shui treasures in China, and finally fell into the hands of Wu Xie, the protagonist of the novel.