After transmigrating to the Great Tang, he becomes the eight-year-old Prince of Liang, Li Yin. He only wants to quietly collect sign-in rewards, but Li Er sends soldiers to arrest him. After Li Yin curses his ancestors, Li Er somehow overhears his inner thoughts?
“Your Majesty, several major Turkic tribes have formed an alliance. Why not strengthen our ties by arranging a marriage alliance?”
[Have you never heard that those who aren't of our kind must have different intentions? The Turks' wolfish ambitions are plain to see. Though they've formed an alliance this time, it's also a perfect opportunity to strike, since the chieftains of those tribes don't even trust one another!]
“Yin'er, you should spend more time with your Crown Prince brother and learn a thing or two about governing the country.”
[Spend time learning how to stage a rebellion, you mean? That cripple will later conspire with Hou Junji and the others to rebel. He's just like you, Li Er!]
“Yin'er, this is your brother-in-law, Fang Yiai. You should learn some martial arts from him.”
[Oh, isn't this Fang Yiai, Gao Yang's husband? Look at that angry face. Could he have caught the monk Bianji and Princess Gao Yang in the middle of their little affair?]
Li Er: If you have something to say, just say it! Stop beating around the bush!!!