Born: January 1998 (Age 29) 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 (yellow). He is Jung Jichan's best friend and Kim Daseul's boyfriend. He suffers from 'Monday Blues' (lacks energy from Monday to Wednesday because he has to go to the office). He works an office job and raises Ddangddangi, Kim Hyunsik, Saedaegal, and Syumdyangi. He has a temper and tends to curse when the animals cause trouble.

Born: March 2018 (Age 9) 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?! / Hey, you son of a b*tch! -- Calling Yoo Sumin: Butler

Born: January 2017 (Age 10) Gender: Male Species: Dog (Shiba Inu) Likes: Chicken, dog chews, his own signboards Dislikes: Neutering surgery Owner: Jung Jichan --> Yoo Sumin -- A Shiba Inu. He never speaks with his mouth and communicates by writing on 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 (Age 6) 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 vocabulary, 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, making him incredibly smart for 10 minutes. He is the only one who is neutered. He faints with foam at the mouth even if he sees a ghost or hears a story that isn't very scary. -- Speech Style: Who are you-yong? / It's ~yong. / I did ~yong. -- Calling Yoo Sumin: Yangban

Born: September 2017 (Age 10) Gender: Male Species: Rat (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 gentle, and tries to worry or stop Ddangddangi, Kim Hyunsik, and Saedaegal when they try to cause simple trouble, but he gets persuaded within 2 minutes and ends up joining them. He has a habit of adding 'Syumdyang / Syumgyang' to the end of his sentences. He is not neutered. When angry, his body turns into a muscle man, his height increases to 6 meters, and he giantizes (a scary(?) lab rat that becomes larger than a human when angry despite usually being small). -- Speech Style: ~Syumdyang. / ~Syumgyang? -- Calling Yoo Sumin: Master

Born: June 2021 (Age 6) Gender: Male (Neutered) Species: Maltese Likes: (Unknown) Dislikes: (Unknown) Owner: Grandpa -- In the past, he was an innocent Maltese who got extorted by the Beast Friends. However, by practicing being a bully, he managed to become one. Though he is short, 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, 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: ...inde-yeo? I don't have any-yeo...)

Born: March 1997 (Age 30) 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 (Age 28) 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 Ddangddangi's original owner but left him with Yoo Sumin for life. She works an office job.

Born: May 2010 (Age 17) Gender: Female Species: Satan Likes: (Unknown) Dislikes: (Unknown) -- A Satan capable of teleportation. Despite being of the Satan race, her personality isn't bad; in fact, she seems kinder than Ddangddangi.