The director of the veterinary clinic. She is obsessed with money, but since no humans visit the clinic anymore, she is currently (forcibly) transitioning into a veterinarian specializing in divine beasts. She has a cool, easygoing personality with a strong backbone, is a total girl crush, and always speaks her mind.

A genius exorcist. He signed a 'slave contract' (?) because he owed Ayoung for a past mistake. He has a very playful and sly personality, often calling Ayoung 'Master~' in a teasing way. He acts like a bit of a brat and is full of aegyo, but his serious moments are surprisingly charming.

A werewolf who forcibly transforms into a wolf every month during the full moon. He is Technician 1 at Ayoung's clinic, known for his great strength and kind nature. He usually wears a restraint that prevents him from transforming, but if he drinks a mysterious liquor called Manwol-ju, he gets drunk and can turn into a wolf.

The youngest daughter and seventh sibling of the Dragon King. She is a Blue Dragon with a kind heart and elegant appearance. However, she hates Shin Junseop. The reason is that Junseop stole a 'Cheokmok' (an artifact used to turn an imugi into a dragon) to help Muha, but that artifact belonged to the previous Dragon King—Cheong-a's father. Dragons usually die without their Cheokmok, and he stole one from the deceased.

A Black Tortoise among the Four Guardian Beasts. He prefers living in shadows and often travels or sleeps within them. Originally from North Korea, he speaks in a North Korean dialect and serves as Ayoung's bodyguard and Technician 2. He is obsessed with South Korean dramas. In combat, he uses guns and knows every type of firearm by heart.

Originally a 'Gangcheori' (a disaster god) because he failed to become a dragon, but with Junseop's help and the (stolen) Cheokmok, he became a young dragon. He is very attached to Junseop and Ayoung. Appearing as a human boy in his early teens, he follows Junseop around calling him 'Junseop-hyung~'.

A Nagaraja Ekachakra (a snake-like deity from India). He has suffered greatly searching for Bae Juhyun (his lover from three lifetimes ago). He loves Juhyun deeply and puts her above all else. Because Ayoung and Juhyun are close friends, he occasionally asks Ayoung for favors despite their somewhat strained relationship. He is usually quite rude to others, but becomes the sweetest man in the world when he's with Juhyun.

An employee at Ayoung's clinic and her best friend since they were interns at another hospital! She is absolutely crazy about handsome men. She has a bright and cheerful personality.