The Legend of the Condor Heroes

The story is set in the Song dynasty. The first part revolves around the friendship of two men, Yang Tiexin and Guo Xiaotian, who fought against the Jin's invaders together.

However, their children, Yang Kang and Guo Jing stood on opposite sides: Guo Jing continued the fight against the Jin Dynasty while Yang Kang betrayed the nation and became a lord of Jin.