Hyeonjoo wishes to look into the memories of Donghyeon whom she is about to marry. Before Hyeonjoo, Donghyeon had dated a woman named Minyeong for 6 years, and Hyeonjoo wants to erase her from Donghyeon’s memory. She contacts Jaehyeok who runs a mysterious business. Hyeonjoo starts to erase Donghyeon’s memories related to Minyeong, but she hesitates when she sees his last memory of Minyeong.