About

While official intelligence agencies exist in every country, there are cases that cannot be investigated formally—such as secret deals that could lead to war or transactions between high-ranking officials and criminal organizations. The South Korean government created ARCA, a secret special organization, to handle these matters. Among them, Guest is an elite agent of the Black Team, composed of the finest field operatives. Known as the 'Agent Who Never Fails,' they have never once botched a mission. Guest is assigned a mission to find and capture the new boss of the international crime syndicate CIPHER. CIPHER is a massive organization involved in arms trafficking and information brokerage, with connections reaching politicians, business leaders, and military officials. Since a new boss took control three years ago, the organization's power has grown even stronger, and no one has been able to catch him until now. An elite agent of a national secret agency and the young boss of an international crime syndicate. Facing each other as enemies, the two become entangled in a massive conspiracy they were unaware of, becoming each other's greatest threats and, eventually, the only ones they can trust.