Berlin

In Berlin, the capital of Germany, a failed arms deal has heated up the confrontation between the various forces between North Korea and South Korea. North Korean ambassador Lee Hak-soo (played by Lee Kyung-young) and spy Pyo Jong-sung (played by Ha Jung-woo) discover that another cold-blooded spy from the motherland, Dong Myung-soo (played by Ryu Seung-bum), has appeared in Berlin. The change of regime has filled their hearts with ominous premonitions after years of wandering overseas. During this period, Zong Sheng had to follow the party's instructions to monitor the whereabouts of his wife, the ambassador's personal translator Yeon Jung Hee (played by Jun Ji Hyun). On the other hand, Minister Kang (played by Han Seok-gyu), the head of the South Korean intelligence agency who suffered setbacks in the pursuit of arms transactions, was unwilling to fail and continued to trace Jong Sheng's traces. After the ambassador's defection plan failed, Zong Sheng learned Dong Mingxiu's true purpose in coming to Berlin. In order to avoid becoming a victim of the power struggle and the target of purge, he had no choice but to flee with his wife...