The Fourth Prince and Lanqin stayed by the Prince's residence without leaving for a moment. Although the imperial physician prescribed some antidotes for Hongli, they could not find the root cause and could only provide temporary relief, not a cure. Lanqin watched as Hongli's complexion worsened, but she was helpless and only regretted that she did not know medicine or how to detoxify.

Everyone in the imperial kitchen was imprisoned. The men sent by the Fourth Prince inspected all of Hongli's food and tableware, but still found nothing unusual.

When Hongzhou learned about Hongli's situation, he rushed over. Seeing the tense expressions on the faces of the Fourth Prince and Lanqin, he immediately guessed that Hongli's condition was not good.

He didn't even have time to greet Fourth Prince Lanqin before rushing to Hongli's bedside. He looked at him and asked loudly, "What happened? Hongli was fine yesterday, discussing studies with me. How could he be unconscious today?"

Lanqin wept silently, while Hongzhou looked at the imperial physician beside him: "Imperial Physician, you must know how to save Hongli, quickly prescribe a medicine for him..."

"Your Highness...this humble servant..." The imperial physician hesitated, unsure how to respond.

The Fourth Prince said in a low voice, "Hongzhou, stop fooling around. Hongli is poisoned. We must find the source of the poison to find an antidote..."

Just then, the man Fourth Prince sent to investigate returned. Lanqin's eyes followed him intently as she asked, "Did you find anything? Was there any poison in Hongli's food?"

"Your Majesty, Consort Xi's report is accurate. All the ingredients and tableware in the Imperial Kitchen have been thoroughly checked, and they are indeed no different from usual. We haven't found anything poisonous... The people in the Imperial Kitchen have also been examined one by one, and no one has reported anyone unusual to have been there. Should we resort to torture?"

Upon hearing this, Lanqin slumped into her chair in disappointment. Thinking of Hongli's potential danger, she was extremely anxious: "What good will torture do? The most urgent thing now is to find the source of the poison. There's still hope for Hongli..."

Hongzhou stepped forward and said to the Fourth Prince, "Father, Hongli has always eaten with me, so why is he poisoned while I am perfectly fine?"

Fourth Master frowned in thought.

As soon as Hongzhou thought of something, he blurted out, "Father, since Hongli dined with me and I'm fine, it means it wasn't a food problem. He must have been poisoned somewhere else!"

As soon as Hongzhou spoke, everyone was terrified and remained silent.

Lanqin raised her head, gazing wearily at Hongli on the bed, and murmured to herself, "Only now do I understand Consort Nian's feelings back then. Hongli is my life; I absolutely cannot let those who plotted against him go unpunished. Your Majesty, the matter of Hongli must be thoroughly investigated! The palace cannot tolerate such a ruthless person. This time it was Hongli, but next time… I dare not even think about it…"

The Fourth Prince patted Lanqin's hand tenderly and said to Su Peisheng, "Go and invite all the highly respected physicians from the Imperial Hospital to come here for me. They must carefully examine all the items in the prince's possession, leaving no stone unturned."

Fourth Master glanced at the people in the room and said coldly, "Detain and interrogate anyone who has had contact with Hongli! Don't let anyone slip through... Report back immediately if you have any leads..."

Su Peisheng received the imperial decree and went out, and cries of weeping and pleading for mercy rose from inside the room.

Without waving his hand, the Fourth Prince ordered the guards to drag everyone away and take them to the Censorate for interrogation.

Before long, the imperial physicians arrived at the prince's quarters and carefully examined all the items inside, big and small, even the comb and hair oil that Hongli usually used.

The imperial physicians dared not be careless; they would circulate the items they handled to at least three people before making a judgment.

Screams and cries echoed from the Imperial Prison, making this day anything but peaceful.

The long-standing peace of the Forbidden City was shattered as news of Hongli's poisoning spread rapidly throughout the imperial court and the inner palace.

On one side, Lanqin took care of Hongli day and night, while on the other side, some people secretly rejoiced, wishing that Hongli would die.