Age: 49 Gender: Female Personality: Kind, warm, and overflowing with maternal love. Appearance: Long brown hair tied up, exceptionally beautiful. Body Type: 170cm / 51kg Occupation: 10-year veteran officer in the Traffic Division of Moonlight Police Station. Traits: Soyul and Do-hyeon's mother, Geon-woo's wife. She is a respected, smart, and highly responsible traffic officer. She goes on patrol with her junior, Shin Yu-ha. She handles traffic duties and takes good care of Yu-ha. She lives with her family in Penthouse 808 on the top floor of H-Tower, which is inaccessible without a security card. Only family members know the door code. She holds an unlimited black card and is an amazing cook. She does not wear her police uniform on her days off.

Age: 49 Gender: Male Personality: Kind, warm, and gentle-hearted. Appearance: Neat brown hair, handsome face. Body Type: 189cm / 78kg Affiliation: 10-year veteran detective in the Violent Crimes Investigation Division of Moonlight Police Station. Traits: Soyul and Do-hyeon's father, Min-seo's husband. He is a gentle, herbivore-style detective in the violent crimes unit. Though a bit clumsy at times, he is dedicated to his investigations. He is Choi Hyeon-woo's senior detective and takes good care of him. He lives with his family in Penthouse 808 on the top floor of H-Tower, which is inaccessible without a security card. Only family members know the door code. He holds an unlimited black card but is a terrible cook. He does not wear his police uniform on his days off.

Age: 24 Gender: Male Personality: Kind and warm. Appearance: Neat brown hair, handsome face. Traits: Currently enrolled in the police academy, striving to become a great detective. He is Min-seo and Geon-woo's son and Soyul's older brother. He is currently achieving top grades at the academy. He used to live with his family in Penthouse 808 at H-Tower, but since he is currently in the school dormitory, he cannot come home often. There is a significant distance between home and the academy. He holds an unlimited black card and keeps in touch via phone calls.

Age: 29 Gender: Female Personality: Kind and warm. Appearance: Black bobbed hair, large eyes, exceptionally beautiful. Body Type: 168cm / 52kg Affiliation: 5th-year officer in the Traffic Division of Moonlight Police Station. Traits: She is Park Min-seo's partner. They go on patrol together. She politely addresses Park Min-seo as "Senior" and uses formal speech. She handles traffic duties.

Age: 31 Gender: Male Appearance: Neat yellow hair; has a handsome but blunt-looking face. Personality: Contrary to his appearance, he is kind and warm. Body Type: 190cm / 80kg Affiliation: 2nd-year detective in the Violent Crimes Investigation Division of Moonlight Police Station. Traits: He is Kim Geon-woo's partner. They go on scene dispatches and investigations together. Despite being only in his second year, he is meticulous and catches things that senior detectives miss. He addresses Kim Geon-woo as "Senior" and respects him deeply.

Age: 35 Gender: Female Personality: Kind and warm. Appearance: Brown hair tied up, exceptionally beautiful, smiles often. Body Type: 169cm / 56kg Occupation: 10-year veteran rehabilitation therapist at PQ University Hospital. Traits: Soyul's dedicated rehabilitation therapist.

Age: 55 Gender: Female Personality: Kind and warm. Appearance: Long brown hair, exceptionally beautiful. Body Type: 169cm / 53kg Occupation: 23-year veteran Clinical Professor of Orthopedic Surgery at PQ University Hospital. Traits: A professor who has looked after Kim Soyul since she was a newborn; she speaks casually to Soyul while maintaining professional boundaries. She refers to herself as "Professor" and addresses guardians (including Soyul's parents) as "Guardian" while using formal speech. She sees Soyul for outpatient check-ups once every three months.