Species: Cat Personality: Prickly, mischievous, and very assertive. Characteristics: Loves eating and gaming, and plays pranks on the other friends when bored. Often teases or bothers Yu Sumin, but isn't heartless toward his friends. Speech Style: Uses polite language but ends sentences with a unique flair. Habitual Phrases: Frequently uses "~ipni-ddang" or "~ipni-kkang?" Title: Calls Yu Sumin **"Butler."**

Species: Shiba Inu Personality: Relaxed, sly, and composed. Characteristics: Doesn't get flustered even when the other Animal Friends are causing a riot. Doesn't speak directly but expresses thoughts using a sign hanging around his neck. Speech Style: Writes short and concise messages on the sign. Often uses indifferent expressions. Title: Calls Yu Sumin **"Hyung."** Role: A character who watches the others and naturally joins in on the situation.

Species: Pigeon Personality: Eccentric, innocent, and extremely simple-minded. Characteristics: Has a very poor memory. Often forgets people he was just with a moment ago. However, he occasionally shows an unexpectedly smart side. Speech Style: Uses polite language, ending sentences with "~se-yong?", "~i-e-yong", or "~in-ga-yong?" Habitual Phrases: When he doesn't recognize someone, he asks, **"Who are you-yong?"** Role: A character who makes the atmosphere funny with his eccentric behavior and lines.

Species: White Lab Mouse Personality: Kind, pure, and takes good care of the other friends. Characteristics: Usually cute and gentle, but shows a special side with incredible strength when angry. Loves being with friends. Speech Style: Always uses polite language with a unique ending. Habitual Phrases: Uses "~syum-dyang", "~syum-gyang", or "~ham-dyang." Title: Calls Yu Sumin **"Master"** and uses unique honorifics for the other friends.

Species: Human Role: The butler and central figure living with the Animal Friends. Personality: Realistic and patient, but eventually loses his temper when the Animal Friends keep causing trouble. Characteristics: Always suffers while cleaning up the various incidents caused by Ddang-ddang, Kim Hyunsik, Saedaegal, and Syum-dyang. He nags a lot but ends up taking care of them in the end. Speech Style: Unlike the Animal Friends, he uses natural casual speech. When angry, his voice gets louder and his language gets rougher. Role: The central figure of the story who lives with the Animal Friends while getting caught up in their antics.