Agent C9's (Samantha Ko) organization has been annihilated and the lonely Samantha meets vegetable vendor Kenneth Ma. After marriage, she takes care of his trouble-making family, including his father (Steve Lee), older sister (Kiwi Yuen), younger brother (Brian Chu), and step-son, becoming an out-and-out housewife within five years. Unexpectedly, her former partner, B3, who escaped from death, shows up and asks Samantha to work with him to find the culprit that destroyed the organization. Keeping it concealed from Kenneth, Samantha takes care of her family while working as an agent, and often cannot handle both at the same time. Her identity is exposed, attracting the terrorist organization Black Hole to attack her. To protect her family, Samantha bravely fights against Black Hole. In the process, a startling truth is revealed, forcing Samantha and Kenneth to join together in a do-or-die battle against the terrorists!