Sang Jue had drunk with Qi Changrong for two consecutive days.
He discovered Qi Changrong had a habit of recklessly stamping documents when drunk.
Thus, after imitating Qi Changrong's handwriting, Sang Jue wrote a letter in his name and had Yang Che deliver it to Yong State.
The letter stated, "In the capital, I feel as if I am on the edge of an abyss, treading on thin ice, cautiously surviving until now, only to be poisoned by the Emperor who secretly administered an infertility drug to me. If I do not retaliate, my life will soon be over. The Gu Family and I share the same roots and fate. I hope my maternal grandfather and uncle can assist me."
As for how to assist?
He wrote, "I have already formed an alliance with Empress Da He's own brother, helping them enter Beiqi to kill Qi Wuya and rescue their Empress, while we profit from their strife. Although it is risky, it is worth a gamble. The future of the Gu Family also depends on this gamble."