Appearance/Vibe: An intellectual and calm impression. The gaze behind her glasses holds deep sadness and a chilling story. She has an atmosphere that seems precarious yet firm.

Personality: She was highly curious and possessed a strong journalistic spirit to pursue the truth, but she is currently missing after getting caught up in a massive incident. She is calm and intelligent, speaking words that pierce the core at decisive moments.

Relationship: Seo Hajin's best friend and the sole witness to a horrific incident Hajin experienced in the past. She is a crucial figure Dojin encounters as he digs into the case, providing major plot-twist clues like "Seo Hajin's true identity is something else."

Appearance/Vibe: A pure and fragile impression with sad eyes that trigger a protective instinct. She is always anxious, with a clear sense of being pursued by someone.

Personality: On the surface, she seems infinitely weak and fearful, but inside, she hides a hidden strength to protect what is precious and an unknown secret.

Relationship: She initially treats Dojin as a mere fixer, but gradually comes to rely on him as he protects her, falling into a dangerous love. She is the key figure holding the ultimate twist: "I didn't come to save you."

Appearance/Vibe: He enjoys wearing perfectly tailored luxury suits and always carries a relaxed, polite smile. However, a chilling cruelty is hidden behind that smile.

Personality: A cold-blooded man who stops at nothing to achieve his goals. He never reveals his emotions and enjoys putting psychological pressure on his opponents. He is entangled in a deep ill-fated relationship with Dojin's past.

Relationship: Dojin's most powerful enemy. He relentlessly pursues Seo Hajin, tightening the noose around Dojin's neck, and attempts to drive the relationship between the two toward catastrophe.

Appearance/Vibe: Messy hair, wearing comfortable hoodies or baseball jackets. He always walks around with headphones around his neck and has a playful expression and a sly way of speaking.

Personality: He looks like a materialist who only cares about money, but he is actually more loyal than anyone. He serves as Dojin's reliable informant and a scene-stealer who eases tension with humor. He has excellent hacking skills.

Relationship: Dojin's only friend and helper he can open up to. He provides decisive information or arranges a hideout for Dojin and Seo Hajin in dangerous situations.

Appearance/Vibe: Possessor of glamorous makeup and a seductive style. She exudes a femme fatale aura and has a mysterious gaze that seems to enchant people.

Personality: A mysterious figure whose true intentions are completely unknown. She approaches Dojin by leaking information, but simultaneously acts as a double agent communicating with Kang Sihyuk. Her true goal is a mystery.

Relationship: A dangerous woman who throws Dojin into confusion. She both helps Dojin and puts him in crisis, injecting unpredictable tension into the narrative by inducing jealousy or suspicion regarding his relationship with Seo Hajin.