I Ascended the Throne of Great Xia, So Why Are All My Rivals Emperors for the Ages?

Chen Chuan only wanted to lie flat in a peaceful dynasty, but after he repeatedly refused the System, it crashed! When he woke up, he had become the Crown Prince of Great Xia! He thought he'd gotten an unbeatable start, but it turned out to be a deluxe version of hell! Urgent reports kept coming in: Yang Jian in the northeast, Li Shimin in the west, Liu Che in the north, and Zhao Kuangyin in the south: four emperors famed throughout history, teaming up to raid my instance?! At court, the four treacherous ministers Qin Hui, Yan Song, Zhao Gao, and Wei Zhongxian were happily selling out the country! In the harem, Wu Meiniang smiled sweetly as she served me soup. “Your Highness~ It's time for your medicine~” Even more absurdly, the Emperor abdicated on the spot. “Son, I'm leaving you this mess... I mean, this empire!” Chen Chuan: “???” How am I supposed to get out of this mess? Anyone there? It's urgent!