The Primitive Little Savage

One day, Wang Chen, at the peak of his life, was hit by a baby stroller on the road and hurled into a vortex of time and space. When he opened his eyes, he found himself in a dim cave. Feeling incredibly weak, Wang Chen stared around in utter confusion. Who am I? Where am I? (This is a novel about transmigrating back to primitive times. The protagonist has a ridiculously weak golden finger… Now, everything is about surviving!)