the biggest festival of the year is about to take place, one of forgiveness and love, but can the town forgive and forget the tragedy of the previous festival of the sun and moon?

Taehyung is a detective charged with the task of solving a centuries-old cold case. Every twenty years exactly, three women would be murdered on three consecutive nights. If the pattern is correct Taehyung's got four months to crack the case and find the killer before anyone else can be killed. With no other options, he calls upon an old friend from junior high that might have the answers.