Xian Qin: I, Ying Zheng, Awaken the Power of the Black Dragon

Brainless cool writing, no system. Traveling through time and becoming Ying Zheng who was working as a proton in Handan City, the power of the ancient black dragon awakened in his body. The nobles of Zhao State laugh at me for living under someone else's roof? Little do I know that their nausea, fear, battlefield aura, and death aura are all resources for my cultivation! Martial arts true energy? Swallow! Wenchen's spiritual power? Swallow again! A country's destiny? Take it as it is!