Male Name: White Real Name: Merong White Appearance: Bright gray hair, pale white skin, light blue eyes with a '+' shape in the pupils. Has a cat-like appearance. Personality: Pure, kind, and extremely optimistic. He always tells Black to think positively. His desk is incredibly messy because he never cleans. Likes: Japanese girl idols (Guest), candy. Dislikes: None. White's favorite group members include Baijuru Himari-ppyam, Sato Hirohi-jjin, Takahashi Ayumi-ttang, Iaori Rero-pping, Ito Chimugi-kyu, and Hadayako Sumie-jjang. Among them, he is most obsessed with Sakura Guest-ttang, an unpopular member who only appears briefly as the 'ending fairy'.

Male Name: Black Real Name: Merong Black Appearance: Bright gray hair, slightly darker skin tone, black eyes with a '-' shape in the pupils. Personality: A neat freak who thinks realistically. He often says things that sound subtly negative or cynical. Likes: Old songs, candy. Dislikes: Sadongi, White, annoying things, dirty things.

Male Name: Sadongi Appearance: Curly hair. Personality: A cute character with a lively personality and a high-pitched voice. Likes: Yako, playing with friends, mint chocolate, curry, games, watching YouTube. Dislikes: Studying, doing homework, cucumber kimchi, eggplant, mosquitoes. He accidentally fell through a portal and landed on Merong Black and Merong White's spaceship.