Sun Bin and Pang Juan are classmates. They study the art of war together. [6] Pang Juan later became an official in Wei and became a general, but he thought that his talent was not as good as that of Sun Bin, so he secretly sent someone to invite Sun Bin to Wei to watch him. When Sun Bin arrived in Wei, Pang Juan was jealous of his talent, so he fabricated charges, sentenced Sun Bin to flogging, cut off Sun Bin's feet [7] and tattooed his face, trying to bury him in the world. When the emissary of the State of Qi went to Daliang, the capital of Wei (now Kaifeng, Henan), Sun Bin secretly met the emissary of the State of Qi as a prisoner and touched him with words. The angel of Qi thought Sun Bin was extraordinary, so he secretly drove him back to Qi. Sun Bin, who fled to Qi, was appreciated by Tian Ji, so he lived under Tian Ji as a doorman. This is the back of Tian Ji's horse racing and Sun Bin's art of war.