Kill Boksoon is a stylish modern-day Korean assassins movie. Gil Bok-soon (Jeon Do-yeon) is the best assassin in the business but also a single mother of a teenager (Kim Si-a) who doesn't know mom's secret. Bok-soon is mulling retirement but head of the company Cha Min-kyu (Sol Kyung-gu) doesn't want her to leave and is willing to manipulate her into re-upping her contract. Meanwhile Min-kyu's sister Min-hee (Esom) hates Bok-soon is trying to get her killed by breaking the assassin's code...

There are some pretty good fight scenes. Two or three times we see Bok-soon envision a fight, see that it's not going to end well, then change her plans. Characters are interesting with no true good or evil and Bok-soon is a sympathetic character (and she only does like two contracts in the film the rest of the time fighting other assassins).

Overall quite entertaining.