Sun Quan? I Am Ying Zheng!

The First Emperor of Qin, Ying Zheng, transmigrates into Sun Quan's body, bringing with him a system, a golden finger, and sixty years of imperial experience. He crushes the Three Kingdoms era and lives to unify the realm. Suppressing Zhang Zhao at the funeral, shooting through mountains with crossbows, burning Cao Cao at Red Cliffs—think that's all? That's just the beginning. In the decades that follow, Liu Bei dies, he lives; Cao Pi dies, he lives; Zhuge Liang dies, he lives; Sima Yi dies, he still lives. He outlives all his rivals, waits until Sima Yan usurps Wei to establish Jin, then leads his army north and personally reclaims the empire. From Sun Quan to the First Emperor, from Jiangdong to Luoyang, a story of 'survival'. The sand dunes are not yet finished; Jiangdong restarts! — Description from novelcodex.org