Son Jin is a cavalryman in Kyou Kai's unit.
Kyou Kai and his scouting unit of 12 cavalrymen realized that they were trapped behind the enemy lines. Son Jin asks to join the main force of the Hi Shin immediately because given the situation, there is no need to explore the area.
Since Zhao's soldiers will be on guard all night, he proposes to circumvent the enemy, although it will be difficult without lighting any fire. Kyou Kai says that they will not circumvent them, but Son Jin is right, they will have to come back for tomorrow so that she can command her men.
When she explains that she wants to infiltrate Zhao's camp in order to kill his officer, Son Jin objects because it is too dangerous. Kyou Kai orders them to hold position and that at the slightest tumult, they run away.