The next day, the emperor is informed that the prince has caught the murderer. He gives the prince a reward for the capture of the murderer and tells him to visit more often. The prince tells the princess that he doesn't need her protection and should leave immediately. The princess tells the prince that Qin has gone insane and has turned black on her nails. She says that no one has visited her in the morning, and that if they tell the emperor that she is insane, he'll think that they lied to him, and so they should hide it from him. The palace is empty, and the prince finds a wooden nail soaked in poison. The nail is called a "soul summoning nail" and it's in a square room with four different directions. He wants to meet with the emperor.