I recommend the historical novel "Three Kingdoms: I Really Don't Know Martial Arts". The main character, Zhao Zheng, was a college student from a drama academy. He accidentally transmigrated to the Three Kingdoms period and became a weakling. However, he was praised by Gongsun Zan as the number one sword immortal in the world. He was regarded as a big shot by Guan Yu, Cao Cao, Sima Yi, and the others, causing a lot of commotion. This was a novel where the main character was a weakling who did not know any martial arts, but the entire Three Kingdoms trembled for him. It met the requirements of the question. I hope you like this fairy's recommendation. Muah ~😗