Wang Can returned home in a sedan chair, exhausted both physically and mentally. He kept thinking about the thrilling scenes in Chengtai Hall on the way.

The Emperor was suspicious. His colleagues were insidious, and his own position was low. Working in the court was tantamount to running with scissors to him, which was really difficult.

As soon as he entered the door, a young servant leaned into Wang Can's ear and reported something in a low voice.

Wang Can was quite surprised after hearing this. He tidied up his personal appearance and walked into the reception room with the servant.

A handsome man was sitting on the rose chair, drinking tea. When he saw Wang Can, he put down the teacup with a smile.

Wang Can held his fist in the other hand obediently, saying with reverence and awe.

"Your Highness, I don't know that you are here. I'm sorry for my negligence."

"It's okay." Huanan He said with an elegant and gentle smile.

"You must be busy with your work. It is really hard for you to get to work early and return home late."

"I come here tonight for two reasons. On the one hand, my best friend has been here to treat your mother, and I want to accompany him. On the other hand, as the envoys of Ying State were killed, I need your help now."

Wang Can paused and then said in surprise.

"Your Highness, your best friend is..."

Hearty laughter sounded from outside the door. Jiang Huaian walked over the threshold with the medicine box on his shoulder and cupped his hand in the other to them with a smile.

"Your Highness, I pay my respect to you. Lord Wang, you are back."

Wang Can was stunned for a moment. His dazed eyes turned to the two men respectively. And then he slapped his forehead, having a moment of enlightenment.

"So, Your Highness, Doctor Hua, you have known each other for a long time! Oops, I'm sorry for my negligence."

Jiang Huaian twisted his beard, waved his hand, and smiled.

"Ha-ha, Lord Wang, it's all my fault. I concealed my true identity deliberately. Please forgive me."

"Lord Wang, His Highness is moved by your filial piety since you have been taking care of your sick and bedridden mother for several years even if you are an important official in the court. So he asked me to come here to treat your mother."

"My surname is Jiang. At that time, I was worried that you would not trust my medical skills, so I pretended that I was a descendant of Hua Tuo. I'm sorry for that, Lord Wang."

"It's okay!" Wang Can's eyes shone, and he was unable to hide his excitement.

"Doctor Jiang, you've effected a miraculous cure. After taking the decoction of herbal medicine and applying some plasters, my mother's bones and muscles don't ache then."

Jiang Huaian nodded and said gently.

"Lord Wang, don't worry. It will only take half a year for your mother to walk again."

Wang Can was overwhelmed with joy. He cupped one hand in the other and bowed to Jiang Huaian.

"Thank you so much, Doctor Jiang."

He turned around, lifted his robe, and was about to kneel to Huanan He, but he was stopped by Huanan He in time.

"Xingzhi, you don't have to do this."

"I respect those who maintain their duty to their parents most. It's easy to do something by yourself, but it is difficult to do it every day for several years, ten years, or even decades."

"It's easy for me to introduce my friend to you, so why bother to mention this? After your mother gets well and you really get rid of your worries, you can work for the imperial court wholeheartedly then."

Huanan He was still as eloquent as before. He drew Wang Can over to his side with a high-sounding reason, and he even mentioned the country, which really touched the upright Minister Wang.

Recalling that it was also the Ninth Prince who took action in time to save him from the humiliation of the envoy team of Ying State when welcoming the team, Wang Can admired the wisdom and mind of the Ninth Prince at this moment deeply.

When Huanan He sat down again, Wang Can said with his hands down.

"Your Highness, you said that you came for the murder cases of the envoys of Ying State. Haven't those two cases been handed over to Court of Judicial Review and the Eastern Depot?"

Wang Can peeked at the silver-haired man's steady and handsome face carefully, feeling somewhat confused.

According to rumors, this Ninth Prince was nicknamed "the cold-faced King Xiaoyao". He indulged in eating, drinking, and gambling only except frequenting the brothels.

He never cared about the affairs of the imperial court. It was estimated that he wouldn't even help lift the sauce bottle at home.

So why was he concerned about the two murder cases of the envoys of Ying State?

Wang Can began to wonder whether he had been carrying too much weight on his official duties recently, which made him have a drumming in the ears and misunderstand the Ninth Prince’s words.

Huanan He and Jiang Huaian looked at each other silently, and then he said to Wang Can with sincerity.

"When the envoys of Ying State came to our Palace, I worked with you, so now I won't hide it from you. I've been favored by His Majesty in the past few years since I came back from the western tribes, but I've never been able to repay it. Now that something happened in the Palace, I want to share the troubles for His Majesty."

"Just before entering your mansion, I went to Court of Judicial Review and saw the blood-stained leaf..."

"Oh?"

Hearing this, Wang Can became interested and asked solemnly.

"What's your opinion on this, Your Highness?"

Huanan He showed a cold smile.

"Someone used that leaf and the shape-shifting technique in a certain kind of martial arts to combine the phantom with the real thing. Then he could kill people invisibly."

Wang Can's eyes shone.

"So the real murderer must know this kind of martial arts."

Huanan He stood up suddenly.

"I've already locked the target through this important clue, and now we only need to do one more thing to make the real murderer appear."

"But the trouble is that I can't speak Ying language, and I don't trust the interpreter in the envoy team. So I came here at night. Xingzhi, please help me."

"Could the real murderer be hidden in the envoy team of Ying State?"

Wang Can suddenly gasped, and his face turned pale.

Huanan He's deep and clear eyes were as cold as ice.

"Xingzhi, just watch how I find out that cunning murderer tonight."

Wang Can looked directly at Huanan He and nodded.

"Your Highness, I trust you. I am willing to follow you."

...

It was on the first floor of the embassy.

Hearing that Da Yi's Ninth Prince brought a fresh object called "Linglong Box", envoys from all over the world scrambled to gather in the hall, wanting to see how magical the box could be.

The square box was indeed exquisite, which was as long as a man's forearm. The base of it was made of sandalwood, and a gold goddess head was carved outside.

A hole was drilled on one side, which was enough for a person's palm to enter and exit easily.

This golden box was originally a film box, which was a tribute the foreign people paid to Huanan Xin. Its principle was similar to the revolving scenic lanterns in the Central Plains.

There was a roll of pictures inside the box. After turning the secret design on the other side of the outer wall, the pictures in the box could be revolved at will at the speed controlled by people to form a moving scene.

When viewing, people put their eyes close to the hole.

Based on his years of investigation experience in the Eastern Depot, after seeing the evidence provided by Wang Can, Huanan He immediately grasped the identities of the real murderer in the two big cases.

However, a mere leaf was not enough to serve as the most favorable evidence.

Time was running out. Huanan He was eager to save Gu Yunxi, so he could no longer allow Court of Judicial Review to continue collecting other clues.

After thinking about it, he decided to devise a plan to find out the real murderer. Under the emergency, he dismantled the foreign film box as a tool.

Sitting firmly on the fauteuil, Huanan He found the target in the crowd with his sharp eyes.

He sneered, unfolded the folding fan in his hand with a "squeak", and shook it twice in a pretentious manner.

"Everyone, please be quiet and listen to me."

Huanan He pulled his blue collar with patterns of clouds and water and cleared his throat.

After the envoys lining up in front of the table turned completely silent, he raised his eyebrows and continued.

"You must have heard that after the envoys of Ying State came to Jing City, two important officials in them were killed one after another, especially General Yuancang who was poisoned. This case is of great importance. Before the murderer is found, everyone here will be suspectable, and no one can return to your country as promised."

He tapped the golden box with the folding fan.

"In order to avoid panic and find out the murderer as soon as possible, Imperial Family Huanan has to take out the national treasure ‘Linglong Box’. With it, we can identify the one who killed the General."

The envoy of Boni was a tall and thin old man who could communicate with people in Central Plains Mandarin.

He had long been attracted by the exquisite and beautiful golden box on the square table. After Huanan He finished his long speech, he took the lead to wave his hand and ask.

"Your Highness, how can this box identify the murderer? Could it be that there are eyes in the box?"

Huanan He put away his folding fan and smiled mysteriously.

"Yes, the box does have eyes. When everyone of you puts your hand into the bottom of the box and allows the eyes to take a good look, it will recognize which is the real murderer's hand, and then it will leave a mark on it."

The old man grinned, shrugged, and shook his head.

"Really? Well, I'm willing to try it first."