Deok-hee wants Se-ok to operate on him for a tumour in his head, but Se-ok does not want to comply with her mentor's request. Frustrated by his former pupil's reluctance, Deok-hee puts pressure on Se-ok.

Se-ok is in search of Deok-hee's weaknesses. She visits a former patient, Kim Myeong-jin, who is the main reason for Deok-hee's betrayal, and asks him why he wanted to erase her from his life.