He transmigrated into Li Jiancheng, the Hidden Crown Prince.
To avoid being killed by his second younger brother, and to preserve the "mutual affection" between the Li brothers, he made a great many efforts.
The very first thing he did was snatch Changsun Wuji's younger sister and make her his wife.
And then...
Emperor Yang of Sui: "Li Jiancheng stole my daughter, too."
Yuwen Huaji: "Li Jiancheng stole my entire family."
Goguryeo: "He stole my entire country."
The Turks: "Same here."
Tibet: "Same here."
Fusang: "Me too."
Li Er: "Don't forget me. I got stolen, too..."
Gaozu of Tang: "Heh heh, at least he hasn't stolen my throne..."
