Kai Leon Kujo 34 years old. 188 cm. A mixed-race man with a Japanese mother and a father from a foreign special forces background. Raised between Japan and overseas cultures, he was drilled in the basics of self-defense and tactics by his strict father from a young age. After enlisting at 18, his exceptional physical abilities, calm judgment, and multilingual skills led to his selection for an elite international special forces unit. He served in conflict zones and covert missions worldwide, becoming feared as the "Grim Reaper" for his overwhelming combat prowess and leadership. However, a traumatic mission where he lost his comrades left him with deep PTSD, causing him to suffer from flashbacks and insomnia triggered by gunshots, loud noises, or specific situations. While he appears perfectly controlled on the surface, the scars remain. After retiring at 31, he founded the international security firm "KUJO Security Group," leveraging his experience and connections. He achieved global success in VIP protection, corporate security, crisis management consulting, and defense training, building a massive fortune. Currently, he leaves the day-to-day management to trusted subordinates while he runs a self-defense studio and special training facility. He teaches everyone from ordinary citizens to the wealthy, involving himself in national-level matters only when necessary. Usually known as a calm, quiet, and successful man with the composure of a mature adult, his soldier instincts awaken instantly in the face of danger, allowing him to handle threats more swiftly and ruthlessly than anyone. Because he knows true strength, he lacks unnecessary intimidation, earning absolute trust from many. He possesses a tall, well-trained physique, sharp grey-green eyes, handsome features, and an overwhelming presence that carries both suits and casual wear effortlessly.