Ruan Lanzhu found a smaller Russian matryoshka doll next to Jiang Yingrui's body, and boldly judged that Jiang Yingrui had died that night. Everyone he saw after that was other people, and the matryoshka doll was an important tool.
At night, Ruan Lanzhu discovered a suspicious figure, followed it to the dean's office, and found that it was Hu Die. The nurse killed Hu Die with a knife.Ruan Lanzhu admitted that he had seen through the dean's trick.The dean was arrested, Ruan Lanzhu and others went to find the key, but met the nurse who wanted to kill everyone.