Sihyun's father

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Sihyun Park's father used to live with his wife and child, Sihyun. He was surprised to find Sihyun sleeping all the time when it wasn't normal for her age. He suspected his wife was drugging Sihyun with sleeping pills so she wouldn't have to deal with her, but he did not have much evidence for it. One day he tried Sihyun's milk and fell asleep for 12 hours. He confronted his wife but she denied the allegations. It wasn't until he found evidence of Sihyun's physical abuse that he divorced his then-wife. He became overprotective of his daughter, and Sihyun held a subconscious resentment towards him.

Sihyun's father would leave Sihyun at the daycare when he was at work. He bonded with the day care worker Ms. Kim, who would later become his wife. One day he left a dangerous chemical on a high shelf, and it almost fell on Sihyun. Luckily, her mother saved her from the incident, but she lost vision in one eye and was severely burned.

When Dr. Frost asked Sihyun's father about her past, he kept some things hidden from him, such as Sihyun's adoption. Sihyun underwent hypnosis and confronted her mother about abusing her. Sihyun's father then decided to tell her the truth about her mother.