Rescued as a child after her family is killed in Da Nang, Vietnam, an orphan is shaped into a skilled assassin by her savior, a legendary hitman. Together, they form a close bond, embarking on countless missions for a clandestine organization. Over time, she develops into a formidable contract killer, renowned for her lethal expertise. Her life takes an unexpected turn when her mentor is brutally murdered while investigating a mysterious clue tied to a decades-old job. Driven by vengeance, she embarks on a solitary quest to unravel the motivations behind the killing and discover the perpetrator.

As she digs deeper, her path crosses with that of a charming and enigmatic operative with unclear intentions. Their interaction sets off a dangerous game of cat and mouse, intertwining their fates. While piecing together the puzzle, she is relentlessly pursued by adversaries with lethal agendas of their own. Amidst the perilous journey, she must confront past secrets and face deceptive enemies, forcing her to rely on her exceptional skills and instinct to survive and seek justice for her fallen mentor.