The male author of the book," Be a Rich Man From Today On ", was called Han Yang, but he did not mention that he had a sister. For novels where the male protagonist was called Han Yang and had an older sister, I could recommend the modern romance novel " Please Spare My Life, Big Sister ". In the novel, the male protagonist, Han Yang, faced his sister's mischievous behavior and started a pleasant journey of playfulness. I hope you like my recommendation.