A Sword Drawn, a Stunning Strike

In this world, people cultivate by drawing on the power of their qi source, unlocking all manner of profound abilities. Ji Feng's father died in battle, and his title was revoked. Good for nothing, Ji Feng only wanted to study medicine and save his mother. But then he discovered that there was something suspicious about his father's death, and began investigating... By the time he had settled everything, he had already fallen into demonic cultivation...