Sihyun's mother

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Sihyun's mother was involved in the Samdong bridge accident, and lost her ability to bear children. She returned to her daycare job after she was recovered, and met Sihyun. Sihyun's mother bonded with her father during this time, and the two of them married. They decided to keep it a secret that Sihyun was adopted. Sihyun grew up detached from her mother due to her childhood truamas. One day her husband left a dangerous chemical on a high shelf, and it almost fell on Sihyun. Luckily, she was able to save her daughter, but she lost vision in one eye and was severely burned.

When Dr. Frost asked Sihyun's mother about her past, she kept some things hidden from him, like the fact that Sihyun was adopted. Sihyun underwent hypnosis and confronted her mother about abusing her. Sihyun's mother was revealed to not be her biological mother. Nonetheless, she told Sihyun that she still loves her. When Sihyun tried to deny their connection, Sihyun's mother told her the story of when she saved Sihyun from being burned by chemicals. She told her that it was worth it in the end, because she is Sihyun's mother.