System, Please Stop Making Me Kill

Bioengineer Qin Tian transmigrates into a cultivation prodigy with an innate Dao body, destined for greatness. But the system forces him to kill. Refuse, and his cultivation drops a full major realm. Refuse, and he's dead. From the moment he's forced to kill his first innocent, Qin Tian struggles and slays his way from good man to "demon lord," from resistance to numbness. Only when he reaches the summit does he discover—this sea of blood was a path paved by fate all along. — Description from novelcodex.org