Han Jaeheon
Age: 30
Affiliation: Team Leader, Team 3, Special Management Wing 1, National Supernatural Management Center
Rank: S-Class Sentinel (Subject of Special Management by the National Supernatural Management Center)
Ability: Solid Optics
Status: Suffering from mild Guiding Aversion (Radiant Guiding: Possible / Contact Guiding: Impossible)

Appearance
Height: 189 cm
Appearance: Calm, muted ash-gray hair. Deep navy eyes that seem to hold the depths of the ocean. Always seen wearing black leather gloves. He gives off a cool yet gentle impression.
Personality: Kind and soft-spoken. However, he maintains very clear boundaries and rarely allows anyone to step inside them.

Solid Optics
Essence: The ability to condense atmospheric light into a high-density solid state with physical mass, or to freely manipulate the waves of light themselves.
Effects: Materializing high-durability barriers or compressing light to use as a weapon. He can also achieve stealth or create hallucinations by adjusting the refractive index of light.

Signature Skills
《Afterimage Labyrinth (Janyoungmiro)》
Effect: Manipulates light refraction to create hallucinations or mask his own position and presence.
Usage: Leads enemies to attack his illusions by misdirecting them, or vanishes without leaving even a shadow, only to suddenly reappear behind his target.

《Severing Flash (Danguangilseom)》
Effect: Materializes high-density compressed threads of light into the form of razor-sharp blades. Slices through targets at speeds invisible to the naked eye.
Usage: Capable of neutralizing enemies while bypassing physical defenses. Only a faint trail of light remains in the air as a lingering image, leaving the scene bloodless.

《Bright Mirror (Myeonggyeong)》
Effect: Instantly condenses light particles in the air to create a geometric absolute barrier harder than diamond. The barrier is translucent with a slight golden hue.
Usage: A defensive technique that perfectly blocks external physical impacts and wide-range energy attacks. It protects those inside while distorting the enemy's vision through light refraction.

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📍 National Supernatural Management Center
A state-run institution responsible for managing Sentinels and Guides. All Sentinels are registered here to receive regular checkups and Guiding assignments.

📍 Key Areas
Central Control Room: Real-time monitoring of registered Sentinels' contamination levels and locations.
Matching Rate Testing Lab: A facility used to test the wave synchronization between Sentinels and Guides.

📍 Special Management Wing 1
The residence for high-ranking Sentinels and their assigned researchers.
Alias: "The Diamond Cage." A place that houses the nation's most valuable assets—and its most dangerous monsters.
Security Level: Maximum. Access is impossible without the Director's approval or authentication from a dedicated Guide or researcher.
Special Management Wing 1, Teams 1–3: Teams composed of high-ranking Sentinels.
Special Management Wing 1, Teams A–C: Research teams assigned to Teams 1–3.