Mixed Martial Arts: Beginning as Duan Zhengchun

[Multiple female protagonists + martial arts arena + happy grudges] Cao Kun, who is watching dramas at home, accidentally activates the god-level acting system and travels through the martial arts arena! So the question comes, If it was Duan Zhengchun, how could he avoid being cheated, give birth to a biological son, hug him from left to right, and enjoy all the blessings of his family? If it's Murong Fu, I want this beauty, and I also want the country. How can I have the best of both worlds? If it were Lin Pingzhi, besides practicing the sword technique to ward off evil spirits from the palace, is there any other way to avenge his hatred and become the leader of the Five Mountains Alliance? If it were Song Qingshu, how could he defeat Zhang Wuji, win the beauty back, and become the number one person in the martial arts world? Cao Kun said: This is the peak match, waiting online, very urgent!