After being sent to another world called "Earth" by an elder with a sinister laugh, Gu Yun discovers that peace and stability are merely a facade. In this city teeming with evil spirits and demons, what will become of his frail younger sister? Thus, Gu Yun makes a decision. For his sister's health and happiness, for her growth, he decides to cultivate her into the strongest human! (A comedic slice-of-life work, guaranteed complete, please enjoy)