Become Li Yuan at the Beginning, and Fight with Li Er to Dig Out the Xuanwu Gate

Librarian Li Yuan brought the system to Tang Dynasty Wude Ninth Year and time traveled to Tang Gaozu. Counting the time, it seems that it is the day before the Xuanwumen incident! Li Yuan, who was familiar with the history of the Tang Dynasty, suddenly panicked. So, my Li Er is going to rebel and force him into the palace soon?