Hyunjin was a devil who was constantly criticized for having a high voice. He was made fun of for his angel like voice. They would pull on his horns and beat him. The other demons found him weak due to his voice

Felix was an angel who was bullied by other angels due to his incredibly deep voice. They would cut his wings and push him to the ground, telling him he should "Go to hell where he belongs". He ends up going to hell and becoming stoic. He knows the devils will hate him for being an angel, but he hopes his voice will help with it

Felix walks into the dark gates of hell, his bright white and gold outfit sticking out like a sore thumb. His halo glows bright and his wings are spread as he enters hell, a cold expression on his face and the cuts on his wings visible.