Intentional Mistake

A female spiritual master was assassinated at the party. The female detective in charge of the investigation discovered that the real culprit was not the assassin. Pulmonary fibrosis or suffocation, which one is the fatal cause? When the hypocritical face of the female spiritual master was revealed, revenge actions also surfaced. Who killed her? How should the female detective break the situation? When suspects surface one by one, where will their fate lead?