Episode 1

S1 E1: Sun Woo, a field agent with the National Intelligence Service, has a mysterious accident while on a mission in China. After returning to Korea, he is assigned to the information analysis team. Hye Rim, a housewife, is completely unaware that her son, Sun Woo, is an agent with the National Intelligence Service. The National Intelligence Service gets tense with a North Korean spy turning herself in. Sun Woo tries to find clues about the accident in China through Soo Yeon, the North Korean spy.