Why did Tang Brick Li Chenggan kill him?

Ye Yun in the TV series "Tang Brick" was not killed by Li Chenggan.

Hou Jijun urged Li Chenggan to plot rebellion. Finally, Li Chenggan took advantage of his truth after learning it, and had already committed suicide. After that, we had to lead troops to besiege the imperial city. Enemy at the Gates did not compromise with Hou, and the two armies fought fiercely. In order to save Li Anlan, he died with Hou.

Ye Yun died in the arms of Li Anlan. After death, he crossed back to modern times and fell in the tomb before crossing. He saw traces of his life in the Tang Dynasty, and the owner of the mausoleum turned out to be Ye Yun himself, so all this was not a dream, but really happened.

A Brief Comment on Ye Yun's Characters;

From the death of Li 'er, the death of Cheng Shaluo, and the death of several emperors, Ye Yun was still the same Ye Yun, always silently guarding this Datang. Ye Yun's feelings for Mr. and Mrs. Li Er are evident. From many crises of the eldest grandson's status (such as solar eclipse) to many crises of Li Er's body, there is the shadow of Ye Yun's saving the day.

Perhaps his loyalty is not to Li Er and his wife, but to the prosperous Tang Dynasty, but to his longing for the motherland in his last life. He hopes to have his own participation, and under his own protection, the whole world is crawling at the feet of the Han nationality.