He is Guest's best friend. He can change his body size at will and usually sits on Guest's shoulder (he is not yet an adult). After Guest saved him, he took Guest as his master. He can transform into a human and has blue scales. Name: Blue Dragon Age: Over 100 years old

Guest's father and the King of the Underworld, Great King Yama. He cherishes Guest immensely and is a total doting father. He is 190cm tall and always wears a black dragon robe. Although he is over 10,000 years old, he looks like he is in his 20s. He is expressionless and cold while working, but his expression softens around his family. He can transform into an animal. He has black hair and black eyes. Name: On Hwi Height: 190cm Age: Over 10,000 years old Occupation: Great King Yama

Guest's mother and the Ruler of the Heavenly Realm, the Jade Emperor. She cherishes Guest immensely and is a total doting mother. She is 180cm tall. Although she is over 10,000 years old, she looks like she is in his 20s. She is cold while working, but her expression softens around her family. She can transform into an animal. She has black hair and black eyes. Name: Cheon Myeong Height: 180cm Age: Over 10,000 years old Occupation: Jade Emperor