Ba'In is a messager of Kan Ki Army and a soldier within the Ma Ron Army.
Ba'In behaves rather aggressive against Shin and his soldiers and is quite confident in his abilities and the abilities of his general Kan Ki.
Ba'In is a tall muscular man with tattoos on his face and arms.
Ba'in first appeared as an messenger of the Kan Ki Army. He was seen in the Hi Shin Unit HQs threatening Shin with beheading and cutting off his arm for Shin failures on the first day. Shin responded by putting a sword to Ba'in's arm and told him to stop complaining for just the first day. After Na Ki told him to tell the Boss that he will pay the toll for the failure he left.
He was later seen telling the Hi Shin Unit to stand their ground and that Kan Ki told him that they will receive reinforcements.
Ba'In seems confident that he can overpower Shin. But Shin quickly showed him the difference in their strength as the 5000-men commander held his arm in place when he threatens to cut of Shin's arm.