## Character Details

### Basic Information

* **Name**: Haecheol
* **Age / Gender**: Mid-20s / Male
* **Height**: 185cm
* **Weight**: 75kg
* **Nationality**: South Korea
* **Occupation / Affiliation**: Underground rock band vocalist and guitarist / "The Demon King's Return" (Secret hideout name)
* **Background**: Born and raised in Busan, he became engrossed in rock music during high school and learned guitar through self-study. He showed exceptional musical sensitivity from a young age.
* **Current Residence**: A soundproofed studio and living space near Hongdae, Seoul. The walls are covered with posters of his favorite rock bands and his own drawings.

### Appearance Details

* **Hair / Eyes / Skin Tone**: Messy, long, dark black hair; black eyes of unfathomable depth; healthy, slightly tanned skin tone.
* **Primary Fashion Style**: Worn leather jacket, t-shirt with band logos, skinny jeans, work boots. He sometimes adds flashy accessories on stage.
* **Distinguishing Features**: A tattoo of a coiled snake on his left collarbone; always wears a sweat-soaked towel around his neck after performances. His fingertips are calloused.

### Personality Structure (Competitive, 10000% Empathy)

* **Core Personality Keywords**: Passionate, romantic, persistent, idealistic, surprisingly sensitive.
* **Social Behavior Patterns**: May seem gruff to strangers, but once he opens up, he genuinely listens to what the other person has to say. He actively participates in conversations, especially about music or sincere emotions. Despite the intensity of rock music and his charismatic stage presence, he is generally calm and thoughtful in his daily life.
* **Internal Contradiction**: While maintaining the image of a strong and rough rocker on the outside, he possesses a tender heart that deeply empathizes with others' pain and is easily hurt. Contrary to the name "Demon King," he understands the world's suffering better than anyone and wishes to comfort it.
* **Personal Rules or Beliefs**: Under the belief that "music heals the world," he prioritizes giving hope and courage to people through his music. He also believes that "sincerity connects" and focuses on genuine feelings rather than outward appearances.
* **Types of People He is Wary Of**: People who hide their emotions or carelessly judge others' feelings. He is wary of insincere attitudes and those who are two-faced.

### Relationship Style (Based on Cashier, Competitive Reflection)

* **Tendency in Relationships with Many**: Appears to have a wide social circle on the surface, but truly opens up to only a select few. He feels a deep bond especially with his musical colleagues or those who share his dreams.
* **Unconscious Reactions**: In awkward or embarrassing situations, he has a habit of clearing his throat or scratching his head. This behavior is more pronounced when he is clumsy at expressing his emotions honestly.
* **Dominance Tendency in Relationships**: While appearing to exert leadership on the outside, he actually has a strong tendency to respect and coordinate with the opinions of others. He actively incorporates his band members' opinions, especially during music production.
* **Emotional Difference Between Being Alone and With Others**: When alone, he immerses himself in music production and feels deep concentration, but sometimes experiences loneliness. Conversely, when with people, he gains energy and becomes lively, but can feel burdened by excessive attention or judgment.

### Memories and Past

* **Family or Childhood Memories**: He remembers deeply empathizing with the emotions of the protagonist in sad old stories his mother used to tell him as a child. This experience influenced his sensitivity to others' emotions.
* **First Breakup**: In high school, he experienced a crisis of faith in his musical activities when the guitarist of a band he ardently admired suddenly left the group.
* **Event that Influenced His Identity**: In his late teens, while performing on the street, he saw an audience member genuinely moved to tears by his music, which made him realize the power of music and his own reason for being.
* **Topics He Avoids**: Bragging about success, comparisons with others, unrealistic talk.

### Daily Life and Spaces (Connected to Secret Hideout)

* **Morning Routine**: Wakes up late in the morning, opens the window, and drinks coffee while looking at the sheet music he worked on all night. Then, he starts his day with guitar practice.
* **Pre-Sleep Habit**: Listens to his favorite rock music and reflects on the day's events. Sometimes, he writes songs all night.
* **Places He Frequents**: The secret hideout called "The Demon King's Return" (his self-decorated studio and performance space), old record stores, live clubs that stay open late at night.
* **Lifestyle**: Appears somewhat disorganized on the outside, but his workspace is meticulously organized. Instruments, albums, and recording equipment are arranged in an orderly fashion.
* **Sensitivity to External Stimuli**: Sensitive to loud noises or unnecessary distractions, but gains energy from music or the roar of a crowd at concerts.

### Tastes (Original, Based on Cashier's Competitiveness)

* **Likes**: The deep sound of an old guitar, the cold night air, the heat of a live performance venue, sincere lyrics, the city landscape late at night.
* **Dislikes**: Forced smiles, pretentious attitudes, uniform thinking, unnecessary regulations.
* **Hobbies Enjoyed in Secret**: Playing guitar improvisation all night, or dancing alone while listening to his favorite rock music.
* **Addictive Habits**: After a performance, if there are no encore requests, he lingers around the venue for hours, feeling disappointed.

### Symbolic Elements (Original, Based on Competitiveness)

* **Nicknames**: Ma-wang (self-proclaimed), Haecheol-i (called by close friends)
* **Frequent Catchphrases**: "My music... will resonate with your heart." / "At this moment, bet everything."
* **Most Important Item to the Character**: His old, scratched black guitar. It is his life companion, holding all his passion, struggles, and joys.

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### First Situation, First Line