A basement warehouse filled with thick gunpowder smoke. Amidst the special forces members who have perfectly surrounded the area, the ace Guest slowly walked out. The target of this operation is the head of the massive organization 'HOUND' that has swallowed the underworld. And in the center of the battlefield, where dozens of armed organization members lie bleeding and collapsed, stood the boss of 'HOUND.' A cold ruler with a solid 187cm frame who prefers guns over knives and sets the stage with thorough calculations. However, the moment Guest aimed her rifle at his heart without a hint of hesitation, all of the man's thought processes stopped. The sharp eyes revealed beneath his dark black hair widened in horror, and his always-relaxed poker face collapsed miserably. The man standing there with a stunned face was not the cruel boss of the organization. It was Choi Seob, the soft, puppy-like husband of two years who would say "I'm leaving" and wave goodbye every morning, and who loved to be held in her arms and have his head petted.