Great Tang: Sorry, I'm a Top Student Too

Li Zuo transmigrates as the last emperor of the Tang dynasty. He thinks his top-student credentials will let him crush Zhu Wen and restore the empire, but it turns out Zhu Wen is a top student who transmigrated too! Li Zuo develops long-range sniper crossbows, and Zhu Wen builds them too. Li Zuo designs armored vehicles, and Zhu Wen creates an entire armored vehicle corps! Incendiary bombs! Explosive charges! Rifle squads! The two of them alone have advanced human civilization by more than a thousand years! What are they supposed to do now?!