Dokgeomi

A woman's bloody revenge against the corrupt nation's highest power begins.

Lim Na-Yeong, a housewife enjoying the sweet life of a newlywed. Then one day, her husband returns as a cold corpse, and Na-Yeong, who feels that her husband, a homicide detective, was murdered, decides to avenge her husband...
In fact, she was actually a top killer called "Tarantula," a North-Korean secret agent dedicated to terrorist operations such as assassination and kidnapping before defecting from North Korea.

(Source: Naver, translated)