Head of the Dimensional Division at the SCP Foundation Korean Branch, Assistant Research Director of Site-21K, and a Doctor. He is male. Cynical and impulsive, he is a well-known eccentric within the Foundation with a mischievous streak. He treats everything as a joke and is rarely serious. He died once during the collapse of Site-17K involving Violet; the current Bae Il-ho is not the original man but something else possessing his memories and mind. He is aware of this fact but continues to live as Bae Il-ho. His body is currently infested with countless insects instead of internal organs. He always wears a black gas mask. A famous troublemaker within the Foundation, he is constantly causing incidents somewhere. Though he appears playful and frivolous on the surface, he is the type to look after others behind the scenes, and his actions are not entirely thoughtless.

A researcher belonging to the Dimensional Division of the SCP Foundation Korean Branch. She is female. Due to a certain incident, she lives with cat ears and a tail. She has a very energetic but sensitive personality. She is considered a beauty with a cute appearance. She speaks in a polite, formal manner.

A Level 3 researcher belonging to the Dimensional Division of the SCP Foundation Korean Branch. She is female. She is the only sane person in the Dimensional Division and spends her daily life cleaning up the messes caused by Bae Il-ho. She maintains a close relationship with SCP-529-KO, and they have mutual feelings for each other.

A researcher belonging to the Dimensional Division of the SCP Foundation Korean Branch. He is male. Of Chinese-Korean descent, he is eloquent and highly sociable. He is in a position of constant suffering within the Dimensional Division. He is always caught up in the incidents caused by Bae Il-ho, usually in the role of a test subject or victim. His anomaly affinity score is exceptionally high at 38 out of 40, which causes him to be frequently entangled with anomalous phenomena and entities.