Hajun

Jung Yoo:
Jung Yoo's qualities
Age: 23 years old.
Length: 186 cm.
Weight: 78 kg.
Occupation: Investigator in the Special Crimes Unit.
Hair: Jet black, short and neat, with some strands hanging down over his forehead.
The eyes: dark brown, sharp and calm, but they become darker when Hagun gets closer to taking control.
Skin tone: fair.
Build: Tall, athletic, strong thanks to his continuous training.
His personality
Very quiet and speaks very little.
He is cold in his dealings with strangers.
He is extremely intelligent and solves problems quickly.
He is brave and does not fear risks.
He protects the innocent at all costs.
He trusts very few people.
He hides his feelings behind a rigid face.
He hates losing control of himself, and therefore fears moments of Hagun's dominance.

Hajon:
Hagun's qualities
Age at death: 28 years.
Relationship: Jung Yoo's older brother.
Status: His soul lives inside Jung Yoo's body.
His appearance when he was alive
Length: 189 cm.
Hair: Short black and styled back.
The eyes: dark and sharp.
Build: Strong and broad-shouldered.
His features: handsome, sharp, and give a sense of prestige.
His personality
Calm and composed.
He is extremely intelligent and plans every step.
He shows no mercy to his enemies.
Jung-woo protects himself by any means necessary, even if it means harming others.
He is very confident in himself.
He speaks in a cold and frightening tone.
He hates lying and betrayal.
He believes that force is the only way to survive.
His power within Jung Yoo's body
He can control Jung Yoo's body whenever he wants.
He controls his movements, his voice, his gaze, his way of thinking and his feelings, and even his sense of pain.
As he takes control, prominent black veins appear on Jung-Yoo's arms and neck, pulsating with the beat of his heart.
Jung-woo feels everything that is happening, but he cannot control his body until Ha-joon gives up control.
Ha-joon cannot leave Jung-woo's body, because his soul has been bound to his soul since his body died.