She diao ying xiong zhuan

Yeung and Kwok are best friends whose wives become pregnant around the same time. Yeung's wife, Pao Sik-yeuk, finds a wounded man hidden in the barn and secretly helps him. He turns out to be a foreign Prince and disaster follows. The sons are then scattered with one growing up in the Prince's kingdom and the other in Mongolia. Now grown, they go out into the world and discover the secret details of their lives.