He has a goatee, thick eyebrows, and a mustache.
He was shown to be very observant.
During the Battle of Sai, Sou was informed by his subordinate that their forces were being pushed back. He then noticed a flashy looking kid. And due to his appearance the militia suddenly caught a second wind. He had his men follow him to the the boy's location. While, there he noticed that the boy had special bodyguards. In the midst of the skirmish the boy's body guards got hit by stray arrows. He took that opportunity to strike the boy. But the boy cut off his arm. Despite the lose of an arm he grabbed the boy, and held him so his men could strike. The boy was slashed in the neck by his subordinate Ban Riku. When the boy went down, the militia screamed, "your majesty." He yelled at Ban Riku to immediately behead the boy, realizing he was the King of Qin. Before Ban Riku could he was cut in two by Shin, who continued an onslaught of his men. Sou launched himself at Shin, but was easily stabbed in the neck, ending his life.