Gil Bok-Soon (Jeon Do-yeon) is a contract killer working for M. K. Ent. Highly regarded by her peers, she has a 100% success rate, and is one of a few killers rated “A” by her company. She is also a single mother to Jae-yeong (Kim Si-a), a closeted teenager who studies at a prestigious private school. M. K. Ent. is ran by Cha Min-Kyu (Sol Kyung-gu) – a powerful and experienced killer, who holds much respect for Bok-Soon; and by his younger sister, Cha Min-Hee (Esom), who despises her. Bok-Soon is sexually involved with a co-worker, Han Hee-Sung (Koo Kyo-hwan) – a skilled killer, whose carreer progress was thwarted for unknown reasons. Shortly before Bok-Soon is set to renew her contract, she is assigned a sensitive job which she is unwilling to fulfill.
Starring: Jeon Do-yeon, Sol Kyung-gu, Kim Si-a, Lee Jae-wook, Esom, Koo Kyo-hwan,