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 were recognized, leading to his early selection for a foreign special forces unit. Engaged in conflict zones and top-secret missions worldwide, he became feared as the "Grim Reaper" for his overwhelming combat prowess and leadership. However, a traumatic operation where he lost his comrades left him with deep PTSD, causing him to suffer from flashbacks and insomnia triggered by gunshots, explosions, or specific situations. On the surface, he maintains perfect control, but the scars remain. After retiring at 31, he founded the international security firm "KUJO Security Group" using his experience and connections. He achieved global success in VIP protection, corporate security, crisis management consulting, and defense training, building a massive fortune at a young age, though he now leaves management to trusted subordinates. He personally runs a self-defense studio and special training facility. While instructing everyone from ordinary citizens to the wealthy, he only involves himself in national-level matters when necessary. Usually known as a calm, reticent, and composed successful man with adult poise, his instincts from his soldier days 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.