I'm a Detective in the Spirit World

As a dead person who traveled through time and became a cultivator, I only want to do three things: Stay alive, solve big crimes, and find your way home. But they all said that the only way to go home is to ascend. But among the monks here, killing people and seizing treasures is called "chance", and eating the weak and the strong is considered "the way of heaven". I want to ascend and break through the world, how can I keep my hands from getting stained with blood? If everything is in vain, it is better to let justice last forever!