In the year AD 1127, the Mongols sacked Bianjing, the capital of the Song Dynasty, and took the Emperor and his brother prisoner. The incident became known as the Humiliation of Jingkang. The Song imperial court was forced to flee south to Lingan. Our story begins 17 years later, in the Niujia Village of Lingan Prefecture, where two sworn-brothers, Guo and Yang, reside…