My Sister Was Killed, I Sacrificed All My Life for Revenge

On that day, Qin Yang faced his sister with the sole belief that he was terminally ill and had only three years left to live, so that he could take care of her until she went to college. However, he received a call that her sister had jumped from the building. That day, Qin Yang watched as his sister suffered fractures all over her body, cerebral hemorrhage, multiple organ contusions, and was placed on a life-long blood medication and ventilator... He thought that his sister could survive, but unexpectedly, the unscrupulous hospital detected panda blood and drained his body. His sister left him forever due to heavy bleeding. That day, he stood blankly next to his sister's body, filled with despair. At this moment, a whisper of the devil came, asking him to use his remaining three years of life as a deal. Instead of fear, he gave birth to hope! He resolutely completed the deal with the devil and gained all the technology and abilities in the world with three years of life! He slowly opened his eyes with a firm expression: "Sister, I will definitely find out the truth and avenge you!" … All living beings are equal, why should I be a miserable person? Three years of life are all on the road to heaven. If the world is unfair, I will make it right. That day, looking at his sister's body wrapped in white cloth in front of him, Qin Yang had only one thought in his mind. All those who harmed his sister must pay with blood! "Never forgive..."