A successful plastic surgeon and Hyeon-su's mother. Responsible for a car accident that burned Hyeon-su's face, she secretly replaces an orphaned girl's burned face with Hyeon-su's, hiding the faceless girl in the basement. She eventually confronts her past, repents, and takes the orphan's spirit to the afterlife.
Their mother-daughter bond is central but becomes damaged by secrecy, guilt, and the face-swap operation.
The plot identifies Yoon-hee as Hyeon-su's mother. Yoon-hee cares for her after the car fire, performs reconstructive surgery, and later embraces her...
Their clinical relationship connects Su-kyoung to the film's recurring beauty and identity horror.
Su-kyoung lies on an operating table while Yoon-hee begins her plastic surgery, saying that it is time for her to become pretty.
This planned procedure places Hye-won within Yoon-hee's circle of surgical patients.
Hye-won decides to receive eye surgery from Yoon-hee.
Yoon-hee's professional authority indirectly places Jae-hui within the film's beauty-centered power structure.
Jae-hui is part of the social circle connected to Yoon-hee's plastic-surgery clinic and later becomes one of the affected patients.
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