Surrounded by Warlords in a Chaotic Age, I Summon the Twin Heroes Han and Bai

The protagonist, Chen Feng, is an ordinary history buff who accidentally transmigrates into a game called Blue Star Conquest, only to discover that he has chosen the hell-difficulty setting.

The Chen kingdom he takes over is beset by troubles at home and abroad. At court, the ambitious chancellor Qin Hui and the scheming general An Lushan plot to seize control of the government. In the imperial harem, the bewitching consort Daji charms the ruler and throws the court into disarray. Beyond the borders, the powerful kingdoms of Qin, Chu, and Qi eye Chen hungrily, while northern barbarians frequently raid its frontier. The previous ruler, having trusted the words of treacherous ministers, suffered the annihilation of his army in a crucial battle, leaving Chen's morale in tatters and most of its territory lost. Later, he discovers that magic exists here too?