A tomboyish friend of the group who has never undergone plastic surgery. She lacks childhood photos and later identifies a resemblance between herself and a missing girl poster. After witnessing the Faceless Girl's true form, she faints from shock and is subsequently drugged by her mother.
Sung-eon is Hyeon-su's most reliable friend during the investigation.
Sung-eon attends Hyeon-su's birthday gathering and later helps Hyeon-su search for Yoon-hee.
Jae-hui's judgment exposes the group's social pressure surrounding appearance.
Jae-hui shows instant dislike toward Sung-eon because Sung-eon is tomboyish and has not undergone plastic surgery.
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