Travel Through the Tang Dynasty and Become a King with a Different Surname

Zhaoyang was originally a physics student at Qingbei University. Due to an accident in an experiment, he accidentally traveled to the Tang Dynasty. He used the system and learned from later generations to achieve ground-breaking military exploits and became the first person of a different surname to be crowned king of the Tang Dynasty. Later, he created the explosive firearm Barrett to help Tang King Li Er sweep the world. In later generations, the Eight-Power Allied Forces never invaded China again. Is there a system? Multiple female protagonists? It's a cool and entertaining story that's hilarious throughout and doesn't have the halo of the protagonist. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.