The male lead went insane after the female supporting character gave birth to the main villain'

Another reason why Su Yan wasn't in a hurry was because she had the system.

"System, prepare a prescription for treating the plague and give it to me later."

System: "...Host, do you remember you owe me two thousand points?"

"I remember, but when you have too much debt, you don't have to worry."

Anyway, your life and my life depend on the success or failure of this mission. If we fail, you won't be able to use the items in your system shop. They will be taken back by the main system. What's the point of keeping them?

But if you lend it to me, you'll survive once I complete the mission, and you'll even have points to cover the debt.

You know how to choose, don't you?

“Host, you’re right. I’ll go and give you the universal cure for the plague right now.”

Having fooled the system once again, Su Yan withdrew her consciousness and looked at the little boy below the hall who asked to join Qin Yan's retinue and become his private soldier.

Su Yan immediately understood that this assassin was not in cahoots with the young general from over a year ago.

Otherwise, he would know that Qin Yan still remembers that betrayal, and he would never keep someone of unknown origin by his side again.

This also proves that the little assassin is not one of Qin Yang's men.

Of course, Qin Yang wasn't the only one who wanted to kill Qin Yan.

There is also the ever-victorious King Qin Ding.

And the various powerful families and clans whose grain and gold and silver had been forcibly taken away by Qin Yan.

Finally, there were the old ministers of the previous dynasty, and the defeated and homeless dogs from all walks of life.

The reasons for Qin Ding's victory are obvious. Like Qin Yang, he knew he couldn't control Qin Yan and was afraid he wouldn't be able to sit in that high position, so he wanted to get rid of Qin Yan.

Those powerful and aristocratic families wanted to kill him because Qin Yan had previously forced them to donate grain, medicine, gold, and silver. They sensed his intolerance towards the aristocratic families from his actions and feared that he would take the throne and deal with them.

The old ministers of the previous dynasty wanted an emperor who was easy to control or "soft-hearted" so that they could manipulate the emperor and keep their current high positions and rich salaries.

Qin Yan's numerous battles, fought from north to south and from east to west, demonstrate that he is not an emperor they can control, nor is he someone who would willingly play the role of a benevolent emperor for the sake of a good reputation.

With Qin Yan in power, these old ministers from the previous dynasty can only be gradually replaced.

Having clean hands and a clean family background might allow one to retain their life and their family business in a secluded corner of the world.

But most of them have dirty hands and questionable family backgrounds.

The only option is to install the easily manipulated Prince Changsheng as the crown prince before Qin Yan returns to Kunjing and seizes the position, and then send someone to assassinate Qin Yan to eliminate any future troubles.

Those last few scoundrels, of course, wanted to assassinate Qin Yan in order to avenge their grievances.

It appears that this assassination attempt involved more than just two groups.

Based on current information, the assassin at the inn is Qin Yang's man, the young assassin is from another faction, and the county magistrate is from yet another faction.

It remains to be seen whether other forces will intervene.

While Su Yan was pondering, Qin Yan had already rejected the little assassin.

He didn't want to raise another person who would betray him, so he didn't agree to let him join his retinue.

However, Qin Yan asked the county magistrate to take the little boy as his godson, giving him a chance to study and learn martial arts, and to change his family's fortunes.

The young assassin, unable to approach the retainers and lest they contract the plague, and knowing his mission was doomed, stabbed himself, intending to spill his blood on the court officials and servants.

Qin Yan frowned. Although he didn't know the boy's purpose, he gave Su Zhan a look when the little boy brandished the knife in his hand to stab him. Su Zhan immediately ordered his men to hold the little boy down.

The little boy struggled, waving his blood-soaked hands and smearing the blood on the hands of the two henchmen.

At this moment, Su Yan said, "Your Highness, it seems he's trying to get his blood on someone else; there might be something wrong with his blood!"

"Could it be poison?" Su Zhan asked worriedly about the two henchmen. "Knock him out and quickly wash the blood off your hands."

"Yes!"

The two of them swiftly knocked out the little assassin and were about to leave to find a place to wash their hands when Su Yan stopped them, "Wait!"

"Has Ayan discovered anything?" Qin Yan turned his head and looked down at her.

Su Yan said with a solemn expression, "Your Highness, if that person's blood were poisonous, the blood color should be darker, but his blood color is normal, so he should not be poisoned."

"Then why would he put his blood on someone else?" Su Zhan couldn't understand.

Su Yan took a deep breath and dropped a bombshell: "Besides poison, the blood could also contain infectious diseases, such as plague!"

Qin Yan and Su Zhan's pupils contracted, and their hands clenched into fists, veins bulging.

The yamen runners and servants below the hall retreated in panic, looking around in alarm and whispering among themselves to those around them from a distance.

The two henchmen, their hands stained with blood, stood frozen in place, fear evident in their eyes.

Qin Yang and the county magistrate looked panicked, but still held onto a sliver of hope, thinking that Su Yan, a young girl, was exaggerating.

"Miss Su isn't a doctor, how would she know this person has contracted the plague?" Qin Yang feigned composure.

The magistrate, his forehead covered in cold sweat and his voice trembling, echoed, "His Highness the Prince of Chang'an is right. It would be best if this young lady did not spread alarmist rumors here. If she causes panic among the people of the city and an accident occurs, she will be arrested and imprisoned."

"Whether it is or not, we can find out by having a doctor from the city examine this person's pulse," Su Yan said indifferently, showing neither respect nor fear on her face.

The plague was a serious matter, so Qin Yan immediately sent people to invite all the doctors in the city.

The servants rode off on horseback to invite them, and within a quarter of an hour they had brought all the doctors in the city.

All the doctors took turns checking the pulse of the unconscious assassin. One doctor had barely taken the pulse when his face turned pale with fear and panic, and he almost instinctively withdrew his hand. "This...this person...has contracted the plague!"

"What?" The doctor behind him was terrified.

Most of the doctors hurriedly retreated to the doorway. If it weren't for the guards outside with long spears blocking their way, they probably would have run out of the county government office, gone home to pack their bags, and left the place.

Only three kind-looking old doctors remained standing there. They exchanged glances and then stepped forward to take the young assassin's pulse.

Amidst the expectations of everyone except Su Yan, the three senior doctors delivered a heavy blow: "This is indeed a seasonal epidemic."

Just then, several servants ran in from outside and knelt on one knee. "Your Highness, many people in the city seem to have gone mad. After mutilating themselves, they rush into their neighbors' houses and smear their blood on the faces of the people. The chief asked me to ask Your Highness how to deal with those mad people?"

"Your Highness, there are also people in the eastern district who have gone mad and are self-harming. The chief has specially sent his subordinates to ask Your Highness for a decision."

"Your Highness, the western district of the city..."

"Your Highness, the North District..."

"Your Highness, the southern district of the city..."

Qin Yan abruptly closed his eyes, concealing the surging killing intent within them.

Those people wanted to kill the entire city, and even more innocent people, in order to kill him!

They all deserve to die!

Su Yan noticed the veins throbbing on Qin Yan's forehead and said with some concern, "Your Highness, the spread of the plague is now unstoppable. We must quickly inform the people to stay at home and not go out, so as to prevent the plague from spreading faster and wider."

"Chang Kai, you lead your troops to guard the four city gates. Do not let the people outside approach the city gates, and do not let the people inside the city leave the city."

Wen'an, you shall lead your personal guards to patrol the western and northern areas of the city, and ensure that no one leaves their home.

Zi'ang, you will lead half of your troops to inspect the eastern and southern areas of the city, and you must not let the people leave their homes.

"If any civilians cause trouble, knock them unconscious and throw them in jail. Do not kill anyone." Qin Yan suddenly opened his scarlet eyes and quickly issued the order.

"Your subordinate obeys!" Su Zhan and Du Qingzhi, the chief commander of Qin Yan's troops, clasped their hands and bowed in greeting.

Qin Wen'an was the only one who remained silent; Wen'an was Qin Yang's courtesy name.

Qin Yan looked at Qin Yang, his gaze intense and piercing, "Qin Yang?"

"Second brother, we have not been contaminated by the blood carrying the plague, so we will certainly not contract the plague. Why don't we leave the city tonight and return to the capital as soon as possible to report this matter to Father and ask him to send imperial physicians to treat the people?"

These common people may die, but he, the dignified King of Chang'an of the Great Zhou Dynasty, cannot die!

He had to hurry back to Kunjing to ask the imperial physicians to treat him. If he unfortunately contracted the plague, with so many skilled imperial physicians around, they would surely be able to cure him!