I Just Want to Become Stronger Secretly and My Strength Will Shock the Heroine

Lu Yun traveled into a world called "The Crazy Young Man" and became the villain's stepping stone for the protagonist's rise. Fortunately, he is not affected by the plot, and the system tells him that as long as it does not affect the plot, he can break through the world barrier and go back if he is strong enough. Lu Yun originally thought that he would be able to go home after just staying secretly for a few years, but to his surprise, the heroine came over desperately... Female protagonist: "Oh my God! Lu Yun actually knocked down a building with one punch. We must not offend him." Lu Yun: "...". "System, I believe you are a ghost"