Tang Dynasty, Turned into an Egg at the Beginning

Li Yuanjia, a graduate of the Department of Archeology, came into contact with a mysterious substance when he participated in archaeological practice for the first time. By chance, he traveled back to the Wude period of the Tang Dynasty. Just as Li Yuanjia regained consciousness, he discovered that he was being held by someone at the scene where Li Shimin ascended the throne to worship heaven; and before the confused protagonist could recover from this sudden incident, he staged a shocking spectacle in front of everyone - he instantly transformed into a translucent egg with a strange light, and suddenly appeared on Li Shimin's altar... The introduction is short and weak, so please move on to the main text.