The Old Theater Coffin Mystery

To fulfill her grandfather's last wish, the female lead takes over the long-abandoned midnight theater in the city. While sorting the venue, she accidentally discovers a strange coffin hidden for many years, and the clues left by the coffin all point to an old case related to her family. As the clues gradually become clear, the long-buried past events are slowly uncovered, and the female lead finally solves the mystery that has haunted her family for decades.