Sun Woo, a field agent with the National Intelligence Service, has an accident while on a mission in China.

Ki Chul, Hye Rim's former boss, shows up at her house and threatens to reveal her real identity to the world.

Ki Chul keeps pushing Hye Rim to bring Sun Woo to him, but Hye Rim decides to turn herself in instead.

Sun Woo suggests to Joong Hyuk a double agent operation using Soo Yeon to find the North Korean spies.

Sun Woo is shocked by Soo Yeon's death but tries to save Soo Yeon's family as he had promised her.

Hye Rim suspects that Ki Chul also planted a wiretap at Yun Jin's apartment and sneaks into her apartment.