A silent battlefield of spies as the center of Asia Kang-in the director of National Intelligence Service's overseas branch leads his Black Team with the best agents in carrying out covert missions. Kang-in is notorious for mercilessly taking any measure to get what he wants earning himself the nickname "Yaksha" a human-devouring spirit. One day Ji-hoon arrives as a prosecutor to investigate Black Team and even with their ignorance he finds out that their real mission concerns a case that can shake up the whole continent. Soon enough Kang-in needs to use all his sources even Ji-hoon to find his way deeper into the case.