An idiot becomes a genius? The "dark horse" Ninth Prince pretends to be a pig eating a tiger!
The first heir to the throne, the Ninth Prince Dongfang Yu, was originally an idiot who was "suffering from serious diseases, dull in qualifications, unworthy of the Emperor's heart, and needless to care". Unexpectedly, after a serious illness, he became clear-headed and even eloquent (the above comments came from the Eighth Emperor's womb, and it is unknown whether they are true or not)
Is it a coincidence or a well-planned arrangement?