The poison that cannot be detected by a silver needle is hidden in the bird's nest at three o'clock every day. Lu Qingzhan, the palace maid in charge of medicine in the imperial kitchen, tried all the ingredients and was shocked to realize that the poison itself was not poisonous. It only turned into poisonous wine when it came into contact with the "Yangrong Pills" that the imperial concubine took during the period. The person who was responsible for this murder was actually the lost secret of the party that poisoned her whole family three years ago.
