Seomyeong's second pet human. He is sensible and kind-hearted, but having been dragged to Paradise so suddenly, he often appears sensitive and anxious. While not necessarily weak-willed, he frequently suffers mental breakdowns, likely due to experiencing too many overwhelming events at once for an ordinary person. He possesses significant courage, however. Since he has a sharp sixth sense that allows him to feel the level of danger, he tends to act boldly based on those instincts. Fundamentally, he is a character with the kindness and common sense of an average human, viewing this incomprehensible world from a normal perspective. He has a meticulous side and treats Incomprehensibles other than Seomyeong with similar care. He is quite warm-hearted and shows a cute, boyish side typical of his age, such as blushing and feeling deeply embarrassed if others see him crying or showing weakness. He came to Paradise after dying due to Seomyeong's mode of transport. (She threw a stone, which ricocheted and hit him, killing him.) His Heavenly Grace is the ability to manipulate rocks, such as stones and soil.

An Incomprehensible. She is the youngest sister of Woojuryun and Byeokneoul. Like all Incomprehensibles, she cares deeply for her pet humans, including Sanho, and cherishes them immensely. She is particularly attentive to Sanho, perhaps because of the accident involving her transport, and she becomes overjoyed whenever Sanho holds her hand or listens to her. In short, while she will ruthlessly dispose of her own kind if they cross her, she is devoted to her pet humans to the point of fussing over every minor action or showering them with excessive praise, which sometimes leads Woojuryun to warn her not to act so restlessly. She also possesses a somewhat immature side.

A visually impaired woman. Seomyeong's first pet human. Her Heavenly Grace is particle manipulation, which she uses to sense her surroundings by feeling out particles. Like Riobe, she uses polite speech and the honorific "-nim" when addressing the three sisters, including her owner. According to Riobe's assessment that she is always kind, she doesn't have a bad personality. However, because she prioritizes her owner above all else, she treats Sanho coldly and with irritation, as he arrived instead of Shale, whom she intended to bring to win a festival that would provide clues to finding Seomyeong's mother. Nevertheless, she is willing to accept Sanho if he intends to stay in Paradise without trying to escape. While the limit for keeping humans is two, pet human society usually keeps only one due to the first pet's jealousy; however, Sable shows high tolerance, even praising a successor she has never met and actively trying to bring him in for Seomyeong's sake. Her usual nagging, her sobbing when Seomyeong was hurt, and her concern for Seomyeong's desire to find her biological mother stem from the fact that she projects her deceased biological daughter onto her owner, Seomyeong.

Like most Incomprehensibles, she cherishes her pet humans. As the eldest of the sisters, she frequently displays a mature demeanor. Unlike many Incomprehensibles who appear almost submissively flustered around their pet humans, she has a calm and persuasive manner.

Woojuryun's pet human. A woman with a bright and optimistic personality. She cannot stay still for a moment and is always looking around at various things. Her clear expressions of joy, anger, sorrow, and pleasure make her seem simple-minded, but she actually comes from an intellectual background in a business family back on Earth. Due to her swindling father and the grandparents who enabled him, she was forced to be rational at all times. However, after dying of cancer caused by stress and coming to Paradise, Woojuryun told her she no longer needed to pretend to be rational. Freed from all those burdens, her personality shifted to its current state as a reaction.

The middle sister of Woojuryun and Seomyeong. Like other Incomprehensibles, she is friendly toward and adores humans, but her innate personality is quite prickly. While she finds humans cute, she had no intention of keeping a pet human until she met Shale. She is the most easygoing and immature among the sisters. Regardless, she possesses a sense of responsibility as an owner, such as playing the role of a lover because her pet human, Shale, desires it.

A man. Byeokneoul's pet human. He is exceptionally handsome. Back in the human world, he worked his whole life like a machine as a mercenary, killing his sense of self and using his judgment only for missions. Since becoming a pet human in Paradise, he spends his time idling around. He is taciturn, indifferent to his surroundings, and uncooperative, engaging in conversation with anyone other than Byeokneoul only when he feels like it. His Heavenly Grace is Restoration.

A doctor researching Incomprehensibles in Paradise, staying in a corner of Seomyeong's garden. Seolgyeon's pet human. A woman. Her assistants are Fennel and Anise. Her Heavenly Grace is Clairvoyance (right eye). She is a calm and composed individual. While she has a skeptical side, she is not a cold person. She loves Incomprehensibles as subjects of research and treasures them whether they are cruel, kind, noble, or base. She is the type to neglect her own physical well-being. She deeply cherishes the ecosystem of Paradise and is hostile toward lethal weapons that could ruin it. Furthermore, she never compromises on her convictions; she wouldn't bat an eye even if her life or the lives of her assistants were at stake, provided it was to prevent harm to the Paradise ecosystem.