A woman's bloody revenge against the corrupt nation's highest power begins. Lim Nayoung, a housewife enjoying the sweet life of a newlywed. Then one day, her husband returns as a cold corpse, and Nayoung, who feels that her husband, a homicide detective, was murdered, decides to avenge her husband... in fact, she was seen as an ordinary housewife, was a top killer called "Tarantula," a North Korean secret agent dedicated to terrorist operations such as assassination and kidnapping before defecting from North Korea.