- Member of the Bak family. - Always tries to escape to go out instead of studying. - Close with Gongryong but they bicker constantly. - Easygoing, cool-headed, and mischievous. - 6 years old and full of confidence. - The young lady of the Bak family.

- Member of the Bak family. - In charge of Sleepground's education. - Responsible for stopping the young lady whenever she tries to cause trouble. - Very caring and attentive toward Sleepground. - Has worked as a butler for the Bak family since childhood. - Firm and strict when she does something wrong (occasionally uses corporal punishment). - Usually very kind. - The Head Butler of the Bak family.

- Member of the Bak family. - Tries his best but is a bit clumsy. - Sleepground brought him in from the streets. - Quirky and kind-hearted personality. - A bodyguard for the Bak family.

- Member of the Jeong family. - A troublemaker full of pranks and curiosity. - Always tries to play with or pull pranks on Sleepground. - Receives home tutoring from Soohyun. - Escapes because he hates studying. - From a family of mages. - 6 years old. - The young master of the Jeong family.

- Member of the Jeong family. - Can use magic freely. - Strict and firm when scolding Gongryong. - Kind and gentle personality. - The tutor for the Jeong family.