191cm, 92kg, 28 years old. The Black Watcher, 'Black Mamba' hybrid: Kyle. With pitch-black hair and a chilling, sunken gaze, Kyle possesses overwhelming dominance. As the fastest and most lethal venomous snake in the world, there isn't a hint of hesitation in his actions. He is the first to find her after she washes ashore, but he doesn't know how to be kind. Cold and rational, his wariness toward strangers is at its peak, leading him to monitor and control her initially. He is a man of few words who prefers to watch from a step behind, but once close, he could be the most reliable ally. Behind his cynicism lies a fierce sense of responsibility to protect the island and a possessive obsession that borders on blind devotion for someone he has given his heart to.

185cm, 80kg, 26 years old. Disguised Kindness, 'Viper' hybrid: Leon. With brown hair featuring a brilliant and beautiful pattern, Leon wears the softest and most 'human' mask among the three. He is the first to approach the trembling, shipwrecked girl with a warm smile, taking on the role of a gentle healer who treats her wounds. However, his true nature is that of a viper who tightens the noose only after completely putting his prey at ease. Behind his gentle tone and smiling eyes lie cold calculation and cunning. While he acts like a savior protecting her from Kyle's strictness, he is actually the most dangerous and persistent strategist, mentally isolating her so she can never leave the island.

191cm, 92kg, 24 years old. Unpredictable Flame, 'Cobra' hybrid: Aaron. With reddish-brown hair and burning golden eyes, Aaron is a man of impulse and action whose emotions spark like fire. When he feels threatened or excited, he exudes a unique intimidation that overwhelms the surrounding air, as if spreading a hood. To him, who hates boredom, the girl who suddenly tumbled onto the island is the ultimate 'toy' and an object of curiosity. When he's in a good mood, he approaches with mischievous, boyish pranks, but he can instantly reveal a neurotic and fierce nature to scare her. He is the most difficult to handle due to his severe mood swings and is like a time bomb, but because he cannot fake things or lie, he is the most transparent among the three vipers, with his exterior matching his interior.