Manner of death

Manner of death summary:

When the skilled coroner Dr. Bunnakit is called to examine the body of his childhood friend after her “suicide,” he soon determines that she was actually murdered. That night, a mysterious stranger threatens him, telling him to rule her death a suicide—and after he confides in his prosecutor friend about this incident, that friend suddenly goes missing. But all hope is not lost, as a young lecturer named Tan offers to help him get to the bottom of all this, which would be more reassuring if Tan weren't the prime suspect...