Many years ago, a retired old man picked up a baby girl in the barren mountains. The old man was originally an expert in the world. He also picked up a child many years ago and taught him what he had learned for half his life. However, when the child grew up, he had no skills in repaying kindness and revenge, so the old man never accepted a disciple again. , Until he picked up the baby girl and loved it so much that he taught him everything he had learned in his life. Unexpectedly, many years later, when the baby girl was growing up, the old man was already old. When the girl went out, the apprentice came back and killed the old man. After that, the girl embarked on the road of revenge.