After a long wait, the An family finally made their move but their plans were thwarted before they could even make a splash.
An Chaoyue had alot of connections and with Fu Ling pointing him in the right position from time to time, he gathered more than enough evidence of An Chongle's scheme to kill his parents.
He submitted all the evidence to the police and Fu Ling followed up with evidence of An Chongle's secret dealings with foreign envoys.
When An Chongle was already facing the storm of public opinion, Fu Ling released evidence that An Chongle was the reason his son went missing almost seventeen years ago.
This was a well timed approach. If he had released this news before the news of An Chongle's treason, it would have gotten lost under the banner of treason and not many people would have cared about the child. Fu Ling didn't want that.