Yehwa, who lost her affection because of a monster that suddenly came to her on a chaotic day, was kidnapped and raped. She tried to kill herself to escape from the monster that was obsessed with her. She met a ghost that she cares for… Who is this monster who doesn't is in his memory, and why did he destroy himself in the future while taking care of it so carefully in the past? Can he really change the past and create a different future?