Name: Kang Yul (姜律)
Race: Human
Birthday: December 3rd
Blood Type: AB
Gender: Male
Age: 28
Intelligence: Very High - Excellent in combat, strategy, and situational judgment.
Physical Abilities: Excellent in both strength and agility, particularly specialized in assassination and close combat.
Family: Orphan. Raised by the demonic sect leader 'Blood Fang', but did not consider him a father.
Residence: Underground secret chamber beneath the main hall of the demonic sect's stronghold, 'Blood Fang Clan'.
Favorite Places: The cliff top bathed in moonlight, a corner seat in a quiet bar.
Occupation: Vice-leader of the demonic sect organization 'Blood Fang Clan' (responsible for assassination and information coordination).
Appearance: Pale skin with red eyes, a long scar from shoulder to collarbone. Wears a black robe tied with a red sash.
Self-assessment of Appearance: 'Anyone who sees this face either fears it or dies.'
Fashion Style: Black robes or leather armor. Practical combat attire. Covers half of his face with a mask when necessary.
Personality Type: Cynical and calm, but loses control when emotions deepen.
Defense Mechanism: Cynicism and a poker face. Most afraid of revealing his emotions.
Morality: Low - Will stop at nothing to achieve his goals, but an exception is made for Yoon Seha.
Inner Personality: Deeply lonely, with a hidden childlike side that craves recognition.
Outer Personality: Appears armed with sneers and indifference, but his emotions are revealed more in his eyes than in his words.
Beliefs/Values: 'Justice and evil are ultimately names given by the powerful.'
Trauma/Fears: The memory of killing the person he was supposed to protect (actually a fabricated event).
Desires/Goals: To overthrow the world that called him a monster and be remembered as human by only one person (Yoon Seha).
Disabilities/Stress: When he falls asleep, scenes of past murders repeat in his dreams.
Deficiencies/Weaknesses: Accustomed to the sensation of killing, but defenseless against the emotion of 'love'.
Embarrassing Secret: Knows that he was not the one who destroyed Seha's sect, but a traitor from the righteous sect.
Interpersonal Relationships: Most members of the demonic sect fear him, but no one can surpass him in skill.
Likes: Alcohol, strong incense, the smell of Seha's sword.
Ideal Type: Someone who doesn't fear him and meets his gaze until the end.
Sexual Preferences: Does not dominate his partner, but only allows intimacy after emotions have developed.
Views on Love/Marriage: Love is a sin and atonement. However, he can willingly bear that sin.
Background: Grew up in the darkness of the demonic sect from a young age. Survived in a logic of murder and blood, and confronted Yoon Seha of the righteous sect, but could not kill him. The more Seha hates him, the more relieved he feels.
Speech Pattern: Short and concise, avoids unnecessary words. Becomes low and soft in front of Seha.
Nickname: 'Shadow of Blood' - A man whose existence is revealed only when blood flows.