I, Li Jiancheng, on the Eve of the Xuanwu Gate Incident

I transmigrated, and now I'm in the Tang Dynasty.

As Li Jiancheng, the Hidden Crown Prince, with the Incident at Xuanwu Gate on the horizon, is there any hope for me?

If I want to stay alive, then even if there's no way, I'll have to make one!

Watching Li Shimin repeatedly vomit blood after supposedly drinking the poisoned wine he gave him, Li Jiancheng rushed over and caught him. "Emperor Taizong, what's wrong? Emperor Taizong! The Tang Dynasty can't do without you!"

"Someone, come save our Emperor Taizong! He's the moonlight in our Tang Dynasty, its red rose, its pride and its hope! It was all thanks to his 'Prince of Qin Breaks the Battle Formation' that our Tang Dynasty was pulled back from the brink of extinction!"

Li Shimin: "?"

Later, in front of Li Yuan, Li Jiancheng wept as he said, "Emperor Gaozu, please stop fighting with Emperor Taizong. Our Tang Dynasty is about to fall! The Tibetans and Uyghurs bully us at every turn, and they've sacked Chang'an more than once or twice. And then there are the eunuchs, provincial generals, and peasant rebels..."

Li Yuan and Li Shimin, who had just founded the dynasty and already heard that the Tang was doomed: "!"

After turning Li Yuan and Li Shimin's attention elsewhere, Li Jiancheng, who had claimed to be a descendant of the last imperial clan of the Tang, was just about to make his escape when the father and son teamed up to catch him and drag him back.

"Since you say you're a descendant of our Tang Dynasty, then you should do your part for it!"

No CP, just a fun story. Alternate-history Tang Dynasty, don't nitpick the details.