Single mother Kill Bok Soon, a deadly assassin with a 100% success rate, works for M.K Ent, a company run by her mentor Cha Min Kyo. Despite their mutual respect, Kill Bok Soon knows her position can be taken away at any moment. Just before renewing her contract, her loyalty is tested when she's caught in a life-or-death situation.

Kill Boksoon
A deadly operative must reconcile her dangerous profession with her maternal duties, leading to a thrilling exploration of loyalty, sacrifice, and identity.