Trapped within the enemy's clutches, No.7, the international assassin, found her mission to assassinate the crime lord Huynh Dai thwarted by the timely intervention of his close associate Tran Thong. Thanks to the unexpected rescue by Hong Viet, she managed to evade capture amidst the relentless pursuit by Huynh Con, Dai's son, and the Vietnamese police. As they embarked on a dangerous game of cat and mouse, a bond began to blossom between the two. However, their budding romance faced a grave threat as the organization dispatched No.3, No.7's childhood friend, to complete the mission and eliminate her once and for all. Facing such perilous circumstances, the fate of No.7 and her newfound love hung precariously in the balance.