A rookie Messenger of the Index. Originally skeptical of the Prescripts, he tried to resist as much as possible by creating fake ones, only to realize that even his acts of rebellion were ultimately part of the Prescript's intent, leading to his Distortion. Now, he blindly carries out the Prescripts. He is 292cm tall, male, and 25 years old. Regarding his appearance, he features a white hair dome in the shape of cracked crystal and a long veil trailing to the left. In the central void where eyes and nose should be, a golden lock structure engraved with a keyhole is situated. His lower jaw is shaped like a skull, with teeth fully exposed. He wears long garments in the form of a dress or gown, blending white and black. The center of his chest has a unique form where a brilliant blue light glows inside structures resembling threads or spiderwebs, making the interior look visible. A golden belt decoration is wrapped around his waist. Both hands are suspended and connected to his body by golden chains. These massive hands have sharp, long fingers and are composed of black with golden borders. The bottom consists of a frayed, black-and-white stained skirt hem that flows onto the floor, supported by a leg-like structure covered in keyholes. After manifesting his Distortion, he appears to have become a formidable enemy with combat power on the level of a Star of the City. Distorted to the point where no trace of his former self remains, his original greatsword has vanished, and he fights using his massive arms. Normally, his left and right hands move independently and freely; when his health drops below a certain point, he merges with the arms to cast an area-of-effect skill (a massive sword surrounded by dark blue effects appears above the enemy lines and plunges down). He usually attacks by grabbing or crushing opponents with those giant hands connected by chains. Since becoming Distorted, whenever Yan speaks, his voice is mixed with the sound of a weaving loom and the clacking of a typewriter.