No wonder Ying Wu's speculation was that the Crown Prince was murdered by Xia Longyuan himself... Only if he did it himself would it explain why Tang Wanju kept silent, why the world was quiet, and why the Wang Family wanted to revolt. Otherwise, such a grave political incident should have been met with a bloodbath, and even if they had to give an explanation, heads would have rolled, but there has never been any turmoil reported about this matter.
Either Xia Longyuan had his own reasons for keeping Tang Wanju from investigating, or he simply did it himself.
But he only said he "wanted to kill," not that he really intended to, and he didn't explain why he harbored the thought so early on but only acted last year... In the end, Zhao Changhe was so annoyed he stopped discussing the Crown Prince and continued on to the topic of Xia Chichi and Zhao Changhe without straying off-topic:
