Apocalypse in the Prosperous Tang Dynasty

In June of the first year of Tang Long's reign, King Li Longji of Linzi, the third son of Prime Minister Li Dan, and Princess Taiping launched a coup in Chang'an City, the imperial capital. Li Longji ended with the imperial army killing Queen Wei and Princess Anle, and completely wiping out the Wei Group. Li Dan was restored to the reign name Jingyuan of Tang Ruizong, and Li Longji was established as the crown prince. Modern students travel through time and become the grandson of Pei Tan, who is famous for being afraid of his henpecks. His first goal now is to survive and see the prosperous Kaiyuan era.