Simulation of Losing Life Span and Becoming Invincible in the End

[No heroine, no harem, no holy mother, decisive killing, cold-blooded, imitative, docile] In Qiankun Continent, Lin Feng, a young man from a mountain village, came back from the dead and boarded the system. By chance, he obtained the system. With a golden finger, he has rapidly improved his cultivation, is decisive in killing, and cautious in mind. During the process of training, he moves forward bravely, breaks through many obstacles, kills the sky, reaches the top, and is proud of the crowd.