From the Start, I Took Down the Princess of Great Sui

Li Chang'an transmigrates to the end of the Sui dynasty and becomes Li Yuanba, the fourth son of Li Yuan. The world is in chaos, with warlords rising everywhere, and his father has not yet had a chance to rebel. But Li Chang'an is already caught up in a scandalous affair. When he wakes up, the person beneath him turns out to be the current emperor's princess. To stay alive, he has no choice but to start a rebellion ahead of schedule...