Tang Dynasty: Only a Fool Would Want to Be Emperor

An ordinary college student from the twenty-first century transmigrates to the Tang Dynasty after getting drunk and becomes Li Ke, Li Shimin's third son.

To keep the crown prince, his older brother who had always treated him well, from being exiled, and to make sure he won't be falsely accused and executed by strangulation in the future, he takes up martial arts of his own accord, gets caught up in court politics, and helps Li Chengqian claim the throne.

But as time goes on, things take an increasingly unexpected turn. Li Shimin wants to pass the throne to him, while Li Chengqian just stands by, giggling foolishly...

Note: The story doesn't move that quickly, and the protagonist has neither a System nor a golden finger.