After Shen Meizhuang was framed by Concubine Hua and Cao Guiren for fake pregnancy, he was grounded in Xianyue Pavilion. Later, Concubine Hua instructed someone to use the tea set used by people suffering from food plague for Meizhuang, and Meizhuang's life hung by a thread. Everyone felt that it was the concubine who wanted to cause Shen Meizhuang to die. 
Later, Shen Meizhuang ate the food sent by the Internal Affairs Office, and Concubine Jing, who was still a concubine at the time, said that it was indispensable to guard against people, so Concubine Jing found that it was poisonous in the meal. At that time, everyone was glad that Sister Mei did not eat poisonous food, and everyone also thanked Concubine Jing for her alertness and intelligence. Everyone, including the audience and Shen Meizhuang himself, thought that the person who poisoned must be Concubine Hua, and there was no second person. 
Because the real murderer was not tracked down afterwards, and the finale of "The Legend of Zhen Huan" was not solved, resulting in the real murderer getting away with it, in fact, the real murderer who poisoned Shen Meizhuang was Concubine Jing, which can be seen from many details. Detail 1: Test the poison for Meizhuang, Concubine Jing has already prepared! Judging from Concubine Jing's usual dress, in addition to the necessary hair accessories, she doesn't like to wear hairpins and other utensils at all. But on the day that Meizhuang's food was poisoned, Concubine Jing happened to come to see Meizhuang, and she happened to be wearing a hairpin on her head. 
Meizhuang was about to eat, Concubine Jing said that since it was a meal sent by the Ministry of Internal Affairs, it was indispensable to guard against people, so she pulled out the silver hairpin on her head to test the poison, and it was expected that the silver hairpin would turn black immediately. 
The poisonous food scared Meizhuang to the point that he lost his soul, and broke the bowl, and when he heard the voice, the guards immediately rushed into the house, but Concubine Jing said unusually calmly: "It's okay, I promised to accidentally knock over the dishes and chopsticks!" He also guided Meizhuang to say that Concubine Hua was going to put her to death! 
Detail 2: Concubine Jing asked that the food in Meizhuang be poisoned not to be publicized. Meizhuang, under the guidance of Concubine Jing, believed that Concubine Hua poisoned her, so she immediately begged Concubine Jing to tell the emperor to thoroughly investigate the person who poisoned her. But Concubine Jing immediately told Meizhuang that I was soft-spoken and unable to speak in front of the emperor. And nervously told Meizhuang that this matter should not be done! Concubine Jing blocked the news from Meizhuang and avoided the emperor's strict investigation of the matter. 
In order not to worry Zhen Huan, Meizhuang asked Concubine Jing not to tell Huan'er about it, and of course Concubine Jing was reluctant to tell her about it. Concubine Jing said that she was afraid that Zhen Huan would be so smart, in case she noticed something. 
Detail 3: Concubine Jing went to the emperor to complain, and she was cheap and behaved! Concubine Jing, who did not fight or rob, quietly went to the emperor and told Shen Meizhuang about the poisoning of the food, and the emperor not only would not suspect her, but would really suspect Concubine Hua. The emperor took Concubine Jing's hand and said affectionately: "Thank you for telling me about the poisonous food of the Shen family, so as to avoid a storm in the harem!" But Concubine Jing said, "We've all discussed it, and you should forget about it after you hear it!" ”
I have to say that this is the effective way for smart people to sue. quietly planted a false accusation to Concubine Hua, and let the emperor remember her good, because she knew that the emperor had been trying to bring down the Nian family because of Nian Qianyao, and Concubine Hua would definitely fall at that time, if Concubine Hua was not at all wrong, the emperor would be difficult to do. But the emperor suffers from no evidence, Concubine Jing is evidence that Concubine Hua was sent to the emperor to harm people! Through this matter, the emperor felt that Concubine Jing's chess piece was useful, and later promoted her to the position of concubine and assisted Concubine Hua in managing the harem, which actually allowed her to check and balance Concubine Hua's power in the harem.
Detail 4: Concubine Hua had no motive to kill Shen Meizhuang. If it is really Concubine Hua who wants to poison Meizhuang, then there is no need! According to Concubine Hua's personality, she must be above board if she wants to kill someone, and there is really no one who is so sneaky and unseemly on the stage when she counts the scenes where she harms people. And Concubine Hua didn't want to kill Meizhuang from the beginning.
After Meizhuang's fake pregnancy and grounding, Zhen Huan wanted to meet the emperor, and Concubine Hua saw Zhen Huan and sarcastically mocked her: "Dare to joke about the dragon descendant, Shen promised to wait for the old death in the palace!" In other words, Concubine Hua only wanted Meizhuang to die in the palace, and did not want to harm her life. In order to make Shen Meizhuang unable to turn over, Concubine Hua sent someone to hunt down and kill Liu Gan, so that she and Cao Guiren framed Shen Meizhuang's fake pregnancy without evidence. But if she wanted to kill Meizhuang, why bother to poison it?
Detail 5: After a thorough investigation by the queen, Concubine Hua did not poison Shen Meizhuang. Later, Concubine Hua fell, and Zhou Ninghai confessed all the charges against Concubine Hua. The queen's confession to the emperor was: "The matter of cassava flour, the death of the noble person, accepting **bribes and sponsors**, instructing the Yu family to poison the concubine, pushing the Hui nobles into the water, framing the Hui nobles for fake pregnancy, and making the Hui nobles infected with the food epidemic." The confession did not say that Concubine Hua poisoned Shen Meizhuang, you must know that this confession is ironclad evidence in the palace. It makes sense that Concubine Jing poisoned Meizhuang.
Detail 6: Concubine Jing's purpose of poisoning Meizhuang. After finding out that the food was poisonous, Concubine Jing gritted her teeth and said: "Back then, Concubine Hua tortured me with small means, and I hated her so much!" "Concubine Jing hates Concubine Hua, from the time she was in Concubine Hua's room, to the time she became the emperor's concubine, she has been suppressed by Concubine Hua, all these years, can Concubine Jing not hate?
Secondly, it is to divide the relationship between Shen Meizhuang and Concubine Hua, as long as Shen Meizhuang has the intention of resenting Concubine Hua, Zhen Huan will become the opposite of Concubine Hua sooner or later. Concubine Jing wants to use Zhen Huan's hand to bring down the enemy Concubine Hua! Again, Meizhuang was grounded, and Concubine Jing, as the head of the first palace, would also be implicated, and Concubine Jing wanted to protect herself by pretending to be poisoned.
In the end, Concubine Jing relied on this poisoning to sue the emperor, leaving a favor in the emperor, making the emperor value herself, not only protecting herself, but also promoting the concubine. It turns out that Concubine Jing, who is honest on the surface, is so scheming, she is really underestimated! It's really a typical representative of a woman's heart needle!