As a favored child, Li Chenggan couldn't walk well because of his foot disease, and his self-esteem was hard to avoid. In order to vent his unwillingness, his actions began to deviate. In this case, the sharp suggestions of the assistant ministers of the East Palace are like adding fuel to the fire. So instead of Li Chenggan? Right? And more and more? The sword goes sideways? . As a result, the suggestions of the auxiliary ministers became more and more sharp. At the same time, Emperor Taizong became more and more strict with Li Chenggan. However, the more so, the stronger Li Chenggan's rebellious mentality. Under this trend, the gap between Li Chenggan and Emperor Taizong is getting deeper and deeper.
At this time, Li Chenggan's compatriot and brother Lee Tae had the heart of succession because of Taizong's love. As a result, Li Chenggan is inevitably worried. He was worried that sooner or later Emperor Taizong would be tempted to change the crown prince. Based on this fear, Li Chenggan first assassinated Lee Tae, but failed. That is, the failure of the assassination plan prompted Li Chenggan to finally make a decision to fight for the palace. In 643, Li Chenggan planned to join hands with Hanwang, Xu and others. Unexpectedly, their plans were leaked before they officially started to act.
Based on Li Chenggan's intention of rebellion, Emperor Taizong abandoned him as Shu Ren and exiled him to Ganzhou. In fact, even if Li Chenggan became rebellious, Emperor Taizong never thought about easy storage. Li Chenggan, on the other hand, was deeply worried about himself and even committed an irreparable felony of rebellion.