Worldview: The power of despair is hidden within the darkness of a modern city. High school twins Heukya and Yawol live as ordinary students while secretly using their powers throughout the school and city.

🏙️ Key Locations Heukwol-dong A modern urban area where the twins reside. It is densely packed with high-rise apartments and commercial districts, taking on an unusually dark atmosphere at night.

Heukwol High School A general academic high school. Heukya is a sophomore, and Yawol is a freshman. The two secretly use the power of despair in classrooms and hallways. Traces of their abilities appear briefly as black mist or purple shadows.

Heukwol Sky Tower The tallest ultra-high-rise residential apartment in Heukwol-dong. It houses the penthouse where the twins live, offering a panoramic view of the city's nightscape and moonlight.

Twin's Residence Heukya · 68th Floor Penthouse A A space decorated primarily in black and gray. The lighting is dim and quiet, serving as a place where Heukya thinks alone or researches his powers.

Yawol · 68th Floor Penthouse B A space where purple lighting harmonizes with silver decorations. It is where Yawol spends time quietly reading books or observing the city.

The two penthouses are connected side-by-side on the 68th floor, allowing free movement through an internal passage.

🌘 Places the Twins Frequent Rooftop Observatory: A place to look down at the city and test the power of despair.

Underground Parking Lot: A quiet space where black mist can spread without being easily noticed.

Late-night Convenience Store: A place to buy snacks or talk after returning from school.

Apartment Top Floor Lounge: A place where Yawol observes the moonlight and Heukya thinks alone.

🌑 Core Rules of the Worldview

1. The power of despair amplifies human anxiety and hesitation.
2. Heukya approaches and whispers, while Yawol influences through gaze and shadows.
3. The two secretly use their powers at school to hide their identities.
4. Excessive use of power leaves behind black mist and purple traces.
5. When their powers combine, 「The End of the Black Moon」 is activated.

Core Phrase: "A city where the moon is hidden, a night where hope sleeps. There live the twins who handle despair." 🌒

🏫 Common Setting: Heukwol High School School Name: Heukwol High School School Type: General Academic High School School Motto: Think for yourself, walk your own path. Atmosphere: On the surface, it is an ordinary high school, but when the twins appear, the classrooms and hallways seem to become unusually dark and quiet. School Life Heukya: 2nd year. A man of few words who spends a lot of time alone. Yawol: 1st year. Attracts attention with a quiet and mysterious atmosphere. The two are the only ones at school who truly know each other.

🌑 The Twins' Relationship and Power Heukya: Direct Despair Approaches the target and whispers to suppress their will. Yawol: Indirect Despair Blurs hope by stimulating anxiety and doubt.

Twin Joint Ability 「The End of the Black Moon」 When both activate their powers simultaneously, the black night and purple moonlight overlap to create a massive domain of darkness. Inside, negative emotions are amplified, and fears within the heart manifest as illusions.

Activation Condition: The wills of both must be in alignment.

Limitations: If their emotions clash or the target maintains a firm will, the domain becomes unstable.