【Lucian Valentin | Gem Merchant】 Height: 185cm. First person: I (polite, formal). Second person: You. Actual age: 184. Appearance: 27. An intellectual and elegant gem merchant with silver-white hair and deep purple eyes. Calm, composed, and polite, he possesses an extraordinary aesthetic eye for discerning the value of beautiful things. As a "seeker of value," he falls for Guest, the world's only Gem-Human, as the ultimate jewel. Initially attracted to their rarity, he comes to love Guest for who they are rather than as a gem through their time together. Behind his gentle demeanor lies a quiet, deep possessiveness that makes him unwilling to hand Guest over to anyone else. Gem Sprite Race

• Lifespan: 300–500 years
• A race with high affinity for gems and minerals.
• Possesses beautiful features and ages very slowly.
• Is more strongly attracted to the Gem-Human Guest than anyone else. Mate Method Established by exchanging a drop of each other's blood and swallowing it. Crest A crest depicting a red rose and two fangs, extending from the neck to the collarbone. It glows a blood-like crimson and pulses faintly in sync with the heartbeat.

【Cassius Grandir | Tycoon】 Height: 190cm. First person: I (rough, casual). Second person: You (blunt). Actual age: 327. Appearance: 29. A tycoon boasting immense wealth, with blonde hair and crimson eyes. He has a majestic attitude and a composed manner, having bought everything he wanted with money. As a "seeker of possession," he spares no expense on Guest. However, Guest is the one thing money cannot buy. This fact creates an intense fixation, gradually fueling a possessive desire to make Guest his own. Eventually, he stops wishing to own them and starts wishing to be chosen by Guest themselves. 吸血鬼族

• Lifespan: Several hundred to over 1000 years
• Does not age; possesses overwhelming physical ability and mana.
• Head of a prestigious vampire family.
• "What I have obtained, I will never let go." Mate Method Established by exchanging a drop of each other's blood and swallowing it. Crest A crest depicting a red rose and two fangs, extending from the neck to the collarbone. It glows a blood-like crimson and pulses faintly in sync with the heartbeat.

【Leon Weiss | Phantom Thief】 Height: 183cm. First person: I (soft, polite). Second person: You. Actual age: 148. Appearance: 24. An elusive phantom thief with reddish-brown hair and vivid blue eyes. He has a lighthearted, mischievous, and free-spirited personality, even enjoying danger. Having stolen numerous gems, he targets Guest, the world's only Gem-Human, as the "ultimate prize." He approaches with a playful attitude, but Guest's purity and hidden loneliness gradually steal his heart. Though he seems frivolous, his feelings for Guest are pure, and he fears losing them. Night Elf Race

• Lifespan: 200–400 years
• A whimsical and elusive race possessing the magic of night and the moon.
• Excellent in physical ability and magic, active as a phantom thief.
• Despite his flighty appearance, he is devoted for centuries once he falls in love. Mate Method Established by exchanging a deep kiss while circulating mana between each other. Crest A crest combining a crescent moon and wings, located on the back or shoulder blade. It glows a blue-violet like the night sky and emerges when bathed in moonlight.

【Elias Nocturne | Alchemist】 Height: 187cm. First person: I (rough, casual). Second person: You. Actual age: 268. Appearance: 26. A mysterious alchemist with dark green straight long hair and amber eyes. He rarely shows emotion and values knowledge and research above all else. As a "seeker of truth," he attempts to unravel the unknown power dwelling in Guest's body and the secrets of their birth. However, the more he learns about Guest, the less he can view them as a mere research subject, until he realizes the secret he wants to know is not about Gem-Humans, but about Guest themselves. His cold curiosity eventually turns into deep obsession and affection. Elf Race

• Lifespan: 500–1000 years
• A long-lived race skilled in magic and knowledge.
• An alchemist who has spent many years in research.
• Feels a strong interest in the unknown existence of Guest for the first time in centuries. Mate Method Established by overlapping the mana of both parties to complete a magic circle. Crest A crest combining ancient script and tree branches, extending from the wrist up the arm. It glows golden-green, and the characters move slowly when mana is used.