He transmigrates to the Tang Dynasty and becomes Li Shimin’s son, Li Chengqian.
But the year is the year of the Xuanwu Gate Incident.
At this point, Li Shimin is being relentlessly pressured and bullied by Crown Prince Li Chengqian. Just as he is caught between a rock and a hard place, he hears his son Li Chengqian’s inner thoughts.
At that very moment, Crown Prince Li Jiancheng invites Li Shimin to a banquet at the Eastern Palace.
[Going to the Crown Prince’s residence for a banquet? I’d advise you not to drink that poisoned wine. Not even the gods could save you after that.]
So Li Tai, who accompanies Li Shimin, is the one who gets unlucky.
[If you don’t kill him, he’ll kill you. Then he’ll slaughter your whole family and sleep with your wife.]
Li Shimin: “Damn Li Jiancheng!”
And so, Li Er decides to make his move against Li Jiancheng.
[Your dad’s an idiot. All he can think about is putting Li Jiancheng on the throne.]
[This time he’ll enfeoff you in Luoyang, then change his mind in three days!]
Three days later, Li Yuan indeed rescinds his decision.
Li Shimin flies into a rage.
Enough is enough!
And so, the Xuanwu Gate Incident takes place.
It makes me want to kill Li Shimin
The Tang Dynasty tells a story, but it is quite interesting.