Great Tang: My Brother-in-Law Is the Crown Prince, and I Swear Brotherhood with Li Shimin

Reborn, he finds himself the son of Su Dan, and his older sister is married to Li Chengqian?

As Li Chengqian's brother-in-law, Su Dingwen feels like his whole world has collapsed. His predecessor had thrown his weight around, relying on his status as the crown prince's uncle to bully everyone, punching Fang Yiai and kicking Yuchi Baolin.

To secure his own happiness and future, Su Dingwen helps Li Chengqian hold on to his position as crown prince.

“Uh, Brother Li, even though I'm your son's brother-in-law, how about we each stick to our own family terms?”

Li Tai is too treacherous? Strip him of his title and make him a commoner! Changsun Wuji supports Li Zhi? Exile him to Lingnan!

He subdues the aristocratic clans and conquers the Western Turks and Goguryeo, earning outstanding military honors. He is appointed Grand Preceptor!

Li Chengqian: “Half the credit for securing my throne goes to my royal uncle!”

Li Chengqian: “Royal uncle, what do you think of this matter?”

Su Dingwen: “I've told you, use our official titles in public! Call me Grand Preceptor!”