Turbulent Tang: Bound to Qin Shi Huang and Emperor Wu from the Start

[Historical power struggle + an emperor for the ages + overwhelming superiority + slow-burn nation-building + no saintly protagonist] Chen Xing transmigrates into the chaotic final years of the Tang dynasty with a miniature technology vault. When he opens his eyes, two eighteen-year-old young men are lying beside him: Qin Shi Huang, Ying Zheng, and Emperor Wu of Han, Liu Che, both reborn! Their lives are bound together, so they cannot harm one another, and Chen Xing has absolute control. From the start, it is the final years of the Huang Chao Rebellion. Bones lie exposed in the wilderness, and for a thousand miles not a rooster crows. Faced with a world torn apart by warlords and unspeakable suffering, Ying Zheng gives a cold snort. "Give me three thousand armored horsemen, and I’ll pacify the Central Plains in six months!" Liu Che draws his sword. "Those who invade our land, no matter how far away, must be destroyed. I’m going to build the strongest centralized empire!"