I think she keep disappeared because she didn’t want Jo Gong to die. She knew she was cursed. Anyone touches…
No, she didn't disappear because she was cursed. She kept disappearing because she had AIDS. She contracted AIDS from the blood transfusion that they gave her when she and her parents got into a car accident. She was afraid of spreading it, so as a little girl, she came up with the lie that she was cursed to get all of the people around her not to come near her/touch her. All of those "cursed" things that happened were pure coincidences.