Gan Ho-Joong (Lee Yoo-Young) is an intelligent robot and a nurse. She is responsible for caring of two women: a mother who been in a coma for 10 years and her daughter Jung-In (Lee Yoo-Young). Jung-In is experiencing severe financial and emotional problems. She decides to kill herself due to her stress. Gan Ho-Joong anguishes over if she should save the mother or daughter.