15 years ago, Kwon Gyeongchan began chasing after his sister’s killer. As a constable at a police substation, he pursues various evil figures who roam the streets under the alias ‘Black Sheep’, hoping that as he pursues the bad guys, he might someday run into ‘that guy’ who murdered his sister. He will go to any lengths to track down the criminals and will do anything to exact his revenge. He also joins forces with detective Kang Cheolho, a detective who is more like a thug than actual thugs, and they launch a large-scale pursuit. Once again, ‘that guy’ is on the move.