Chi Kangren, captain of the black team engaged in South Korea's overseas covert operations, is active in Shenyang. Kang Ren is experienced and is often called "Yasha". He will do whatever it takes to accomplish his mission. One day, the National Intelligence Agency (NIS) found that all the reports on the developments in Shenyang were false, and the report was provided by the black team. Lian Dingyuan, the fourth director of the National Intelligence Academy, was deeply disturbed by this and dispatched Han Zhixun from the Central Local Prosecutor's Office of Seoul as a special prosecutor. Yasha and the black team tried to get rid of Special Prosecutor Ji-hoon, but Ji-hoon stubbornly followed the black team's actions.