李泰
By this point, Emperor Taizong had begun to favor his son Li Tai over his oldest son and crown prince Li Chengqian. When accusations were made that the high-level officials were disrespectful to Li Tai, Emperor Taizong was initially angry, rebuking the high-level officials. However, Wei responded that those high-level officials should, in fact, be more honored than the imperial princes, as the state's key personnel, and Emperor Taizong, seeing that Wei was correct, apologized.