The assassination at Baihe Temple six years ago has never raised any suspicion toward Xu Yin, including from the Liang Family.
Liang Chen is a smiling tiger; don't be fooled by his amiable demeanor. Xu Yin saw him kill before—one moment he was chatting merrily with the enemy, and the next moment his blade had pierced through the opponent's chest.
Back then, Xu Yin misjudged, thinking that after Liang Qin and his brother died, the Liang Family would fall into decline. Unexpectedly, that youngster Liang Chen managed to single-handedly reverse the situation and lifted the Liang Family back into the ranks of prominent ministers.
With that prior lesson, he would certainly not make the same mistake again. How could he afford to underestimate Pei Zhan?
Speaking of which, last winter during the army's triumphant return, Xu Yin genuinely worried for a while, as he was uncertain about what would happen after Liang Chen's return.