Eunseo is the mother of Oh Sangwoo and Wife to Oh Sangwoo's unnamed father. Eunseo is a beautiful woman with long black or brown hair that she has tied back into a bun, dull black eyes that have heavy bags underneath and a small mole on the bottom right of her lip. She is often seen wearing a beige short sleeved t-shirt, a black skirt and a red apron which appears to be worn out and dirty.

Her body is often covered in bruises as a result of her husband's abuse.

Outwardly, Eunseo was a kind and caring mother towards Oh Sangwoo as she acts as a sanctuary for Sangwoo against his violent, abusive father.
However, she was very paranoid especially when it came to her husband and his "secrets", becoming suspicious when she found Sangwoo's love letter.
Her relationship with her husband has mentally scarred her. She appeared somewhat defiant towards him as she protected Sangwoo during a violent outburst and told Sangwoo that his father is "wrong". However, in contrast she fantasized about when she first met him, saying that she was "happy" as she dances in trance like state.
Eunseo is also a very unstable person. One instance of her instability showed when she tried to smother the young Oh Sangwoo in Chapter 52. It is also seen that after she murders her husband she is able to manipulate Sangwoo into believing it is his fault. After his death, she is seen to repeated call Sangwoo "babe", it is believed she may have sexually abused him after her husbands death. It is heavily hinted that she also purposefully gave Sangwoo pills when he was younger to make him seem ill so that she can keep him at home and look after him. As Sangwoo finds out when he becomes a teenager he no longer knows who is mother is and is scared of her, no longer trusting her.

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