Facing Master Wen Yuan, Chu Liang could temporarily put not his guard. Having spent a long time together, he now held considerable trust towards this current Sect Leader of Shu Mountain, in some ways, Master Wen Yuan filled in part of the void left by Chu Liang's former master.
At the very least, this Sect Leader genuinely has Shu Mountain at heart.
Of course, Chu Liang did not inform him about the fact that he harbored the White Pagoda; mainly because he himself still didn't understand why the White Pagoda had fused with his being, nor did he know how to separate the White Pagoda from his Godly Soul. Regardless, he tried a long while ago to conjure the real entity of the White Pagoda, but to no avail.
If this matter was revealed and upon hearing about it, Master Wen Yuan, for the sake of the Demon Suppression Tower, Shu Mountain and the Righteous Path, might shed tears as he beheaded Chu Liang, where then could he find justice?