Guiyang Ridge is one of the Five Ridges in ancient China. It is overgrown with vegetation, densely forested and rarely visited by humans. In the late Song Dynasty, a strange legend spread in Guiyang Ridge. According to legend, hundreds of Yuan soldiers once poured into Guiyang Ridge, but in the end no one survived. Even in such a forbidden area, more and more refugees suddenly appeared. They formed villages there and lived in peace and contentment. But, can their lives really go on peacefully? By chance, several young people entered the jungle-covered Mangshan Mountains. Will those young people, like the others, never come back? What strange things will they encounter in Mangshan? "Legend of Knights" will uncover layers of shady stories for you and decipher bizarre stories one after another.