She is the first person other than Je-Ha that Chae-Rin becomes able to see. She is a "rumor amplifier," who can make any gossip seem realistic and spread it around. In the original novel, she spread rumors about Chae-Rin and Je-Ha. Chaer-Rin takes advantage of Se-Eun's talents to convince the other class members she is telling the truth about the zombie apocalypse.