As they trace the clues to Hou Bin, he mysteriously commits suicide. They find out that General Leng’s medicine has been tampered with, causing him to become ill. They resolve the mystery of the soldiers going insane to a powdered form of the Datura flower seed. They reach a dead end when the person who has been causing the mysterious illnesses suddenly turns up dead, himself. (Source: frankly at MyDramaList)