In the TV series East Palace, the Crown Prince was killed by two emperors. He wanted to inherit the position of the Crown Prince, so he killed the Crown Prince on his way to Xizhou and blamed the crime on the people of Dante. The second prince is an unscrupulous person. He not only killed the prince, but also wanted to sacrifice the fifth prince, Li Chengyin.

Prince Li Chengji clashed with the emperor for exposing cheating in the imperial examination. In a rage, the emperor severely punished the Crown Prince, immediately set out for Xizhou to seek relatives and friends, and then went to Xijing to protect the government, but he could not return to the DPRK until after the army was established. Prince Wu decided to go with his eldest brother, Li Chengji, and take good care of him on the way, but this trip was equivalent to exile, and it was difficult and even dangerous.