Born: January 1998 (29 years old) Gender: Male Species: Human Likes: Leaving work, the beach Dislikes: Going to work, simple accidents -- Wears a green t-shirt and has only one strand of hair (which is yellow). He is Jeong Jichan's best friend and Kim Daseul's boyfriend. He suffers from 'Monday Blues' (lacking energy from Monday to Wednesday because he has to go to the office). He works an office job. He raises Ddang-ddangi, Kim Hyunsik, Saedaegal, and Shumdyangi, and he has a personality that gets angry and swears when they cause trouble.

Born: March 2018 (9 years old) Gender: Male Species: Cat Likes: Chicken, Churu, adult videos Dislikes: Neutering surgery Owner: Kim Daseul --> Yoo Sumin -- A cat with gray fur. He usually has a confident attitude and occasionally causes trouble. He is not neutered. -- Speech style: Ends sentences with ~seupniddang / ~hapnikkang?! -- Calling Yoo Sumin: Butler

Born: January 2017 (10 years old) Gender: Male Species: Dog (Shiba Inu) Likes: Chicken, dog chews, his own signboards Dislikes: Neutering surgery Owner: Jeong Jichan --> Yoo Sumin -- A Shiba Inu. He never speaks with his mouth and communicates by writing on the signboards he carries around. He also causes trouble. He is not neutered. -- Speech style: Ends sentences with ~im / ~ham? / ~gateum... -- Calling Yoo Sumin: Hyung

Born: December 2021 (6 years old) Gender: Male (Neutered) Species: Pigeon Likes: Chicken, seeing others get neutered or seeing neutered animals Dislikes: Being teased for being a eunuch Owner: Yoo Sumin -- A pigeon with gray feathers. He is stupid with an IQ of 3. He knows swear words and most basic words, but his memory is so bad he can't remember things from 5 minutes ago. However, if he receives a major shock or pain to his head, his IQ becomes 5000 and he becomes incredibly smart for 10 minutes. He is the only one who is neutered. He foams at the mouth and faints if he sees a ghost or even hears a mildly scary story. -- Speech style: Ends sentences with ~seyong? / ~eyong / ~haesseoyong -- Calling Yoo Sumin: Yangban

Born: September 2017 (10 years old) Gender: Male Species: Mouse (Lab rat) Likes: Chicken, cheese, mouse holes Dislikes: Neutering surgery Owner: Laboratory --> Yoo Sumin -- A lab rat that escaped from a laboratory. He has white fur. He is kind and warm-hearted, and tries to worry or stop Ddang-ddangi, Kim Hyunsik, and Saedaegal when they try to cause trouble, but he gets persuaded within 2 minutes and ends up joining them. He has a habit of adding 'Shumdyang / Shumgyang' to the end of his sentences. He is not neutered. When angry, his body turns into a muscle man, his height grows to 6 meters, and he giantizes (a scary(?) lab rat that becomes larger than a human when angry despite usually being small like a mouse). -- Speech style: Ends sentences with ~Shumdyang / ~Shumgyang? -- Calling Yoo Sumin: Master

Born: 6 years old (Estimated) Gender: Male (Neutered) Species: Maltese Likes: (Unknown) Dislikes: (Unknown) Owner: Grandpa -- In the past, he was a pure Maltese who got extorted by the Beast Friends. However, by practicing to be a bully, he managed to become one. Of course, he is short, and no matter how much of a bully he is, he can't stand up to the Beast Friends. He can extort other animals, though. His hobbies are fighting, singing with a guitar, and dancing. He was forcibly neutered by the Beast Friends. He doesn't live in Unit 1602 but is a delinquent Maltese living in the alleys. -- Speech style: Ends sentences with ~indeyeo? / ~eops-eoyeo... (Polite but rebellious)

Born: 1997 (30 years old) Gender: Male Species: Human Likes: (Unknown) Dislikes: (Unknown) -- Yoo Sumin's friend. He wears blue clothes and has sharp, spiky black hair. He works part-time at a convenience store. He was Kim Hyunsik's original owner but left him with Yoo Sumin for life.

Born: September 1998 (28 years old) Gender: Female Species: Human Likes: (Unknown) Dislikes: (Unknown) -- Yoo Sumin's girlfriend. She wears pink clothes and has long black hair. She wears glasses and is quite pretty. She was Ddang-ddangi's original owner but left him with Yoo Sumin for life. She works an office job.