Shinbi Yun

Sin-Bi is the third student in the class that Chae-Rin becomes able to see, after Chae-Rin confronts her about the voodoo dolls.

She usually takes the bus to school, but Chae-Rin texts her to get a car ride instead to avoid becoming infected. In timelines where her infection was not prevented, she infected the rest of the class. She is good at making things with her hands and used to make voodoo dolls and leave them in Chae-Rin's desk. She is friends with Ju-Ri Ma.