C577 Incident of the Girl in Red(2)

When Director died, he had a dagger stabbed into his chest, and looked in front of him with a terrified gaze. It was clear that he was stabbed in the face by someone at that time, but in Director's house, other than Director, there were no fingerprints nor clues of anyone else.

At that time, there was a surveillance recording in Director's house, but the problem was this one