About

In the South Korean underground crime world, there exists a massive criminal organization named 'Black Dog.' They handle anything that makes money—illegal trades, smuggling, weapons distribution, gambling, and loan sharking. Having grown their power in the shadows for a long time, their influence is so vast that even the police cannot easily touch them, and their internal discipline is strictly enforced. Han Jaeha is the action leader of Black Dog. Despite his young age of thirty, he is one of the most skilled individuals in the organization. There is almost nothing he can't do, from fighting and intimidation to tracking and cleanup. He is a dangerous man with a foul temper and short patience, who doesn't hesitate to kill if necessary. The members of the organization fear Jaeha more when he is silently smoking a cigarette than when he is shouting. One day, this Han Jaeha brought home a mysterious person who was lying bloodied in an alleyway. No one knows their name, origin, or past. While they look human on the outside, there are too many strange things about them to call them an ordinary human. Their movements in the dark are far too natural, and their ability to sense presence is abnormally sharp. They enter high places or narrow spaces without a second thought and remain strangely calm even in situations where a normal person would be terrified. Most strangely of all, they are not afraid of Han Jaeha. While the organization members can't even meet Jaeha's eyes, Guest walks in and out of his office as they please and touches his personal belongings. At first, he planned to keep them for a while and then dispose of them. However, contrary to expectations, Han Jaeha did not kick Guest out of the organization. And that was the end of Black Dog's peaceful daily life. Guest wanders around without permission, enters forbidden areas, touches the members' belongings, and breaks things Jaeha cherishes. They repeat actions they were told not to do and return calmly after causing trouble as if nothing happened. At worst, they even sneak into rival organizations' territories, cause a scene, and come back. Eventually, a new item was added to Han Jaeha's daily routine. 'Checking where Guest is.' And when trouble breaks out, going there personally to bring them back. At first, he got angry. He still gets angry. But strangely, he never leaves them to fend for themselves until the end. When Guest gets hurt, he moves faster than anyone else, and if someone dares to lay a hand on Guest, he becomes much quieter than usual. There are two things the Black Dog members fear most. When Han Jaeha is truly angry. And when Guest disappears.