The blanket belonging to Old Master Su could not be called clean, though it wasn't entirely dirty either.
Given the Su family's standing, their elder would certainly not be treated this way if he weren't bedridden.
While internally cursing Su Qishan and Zhang Rufen for not even bothering to change the elder's blanket, Su Xingyang moved closer to the spot Zhou Yu had indicated and began to sniff it carefully.
"This blanket seems no different, apart from a musty smell, there's also a distinct medicinal odor. This must be from the residual medicine on Grandpa's lips after he drank it, which is why..."
Su Xingyang was deep in thought.
Wait a minute!
Suddenly.
He had an epiphany!
Zhou Yu had asked him to smell the elder's blanket, and now he understood why.
"Dad! There are residual medicinal stains on here!" Su Xingyang turned his head and shouted towards his father, Su Qichuan.
Medicinal stains?
Su Qichuan paused for a moment, then also understood.
He walked closer, looked at the elder, and said emotionally, "Dad! I didn't expect you had such a trick up your sleeve!"
Su Qichuan, as a matter of course, assumed that the elder had discovered the poisoning long ago and deliberately left the stains on his lips.
Over time, more and more medicinal stains had accumulated on the blanket, and the smell had become even stronger.
This was the best evidence!
However, Su Yuyan, standing nearby, didn't see it that way.
Her second uncle and cousin barely visited the elder a few times a year. How would they know that the blanket wasn't changed because the servants responsible for the elder's care were not diligent?
Or rather, her father and stepmother were indifferent to the elder who was confined to his bed.
Otherwise, how could such a situation arise?
In fact, a few months ago, Su Yuyan had scolded the servants caring for the elder after discovering this. But it didn't last long; within half a month, the servants' attitude towards the elder reverted to its original state.
And as the elder had been lying in bed for a long time, he no longer cared about such matters.
Su Yuyan, feeling helpless, couldn't bring herself to scold the servants again.
Unexpectedly, she had been increasingly pressured by her father and stepmother recently to marry Zhang Shaohua, thereby forging a business alliance between the two families through a marriage arrangement. As a result, her visits to the elder had gradually decreased.
And the servants' attitude towards caring for the elder had become even more neglectful.
Thinking of this, Su Yuyan felt immensely guilty towards her grandfather.
If she hadn't been visiting less often, things surely wouldn't have reached this point.
However, the outcome was ultimately pleasing.
As the saying goes, a blessing in disguise, this was precisely the situation.
"Cough cough..."
Facing his excited second son, Old Master Su coughed awkwardly.
In reality, he had been prompted entirely by Zhou Yu.
Without Zhou Yu's reminder, he would never have thought of this detail.
Seeing the situation, Zhou Yu knew that Old Master Su was feeling embarrassed, so he said, "Second Uncle, don't you want to know what ingredients are contained within these residual medicinal stains?"
"What is it?"
This time, before Su Qichuan could speak, Su Qishan stepped forward first.
Judging by the concern displayed on his face, one would think he was the one who cared most about Old Master Su.
Behind him, Zhang Rufen's eyes were already glazed over, her gaze unfocused.
Su Qishan's action was intended to divert everyone's attention and prevent them from noticing his wife's expression.
She was about to give herself away!
Despite Su Qishan's seemingly calm demeanor, he was actually more nervous than anyone.
He had never expected.
That a servant's momentary oversight would allow Zhou Yu to find the only clue!
"Damn it, Old Liu! I told you to take care of the elder, and you left evidence at the crime scene!"
Su Qishan thought resentfully.
The servant responsible for caring for Old Master Su was named Old Liu.
He wished he could slap the man to death!
A useless good-for-nothing who messes things up but can't accomplish anything.
"It's over. If Zhou Yu knows someone poisoned the elder, he'll surely be able to find the unique medicinal herb added to the residual stains."
Zhang Rufen was filled with remorse.
It was precisely because the continuous poisoning over the years had gone undiscovered that she had become careless.
Otherwise, Old Liu, who was responsible for the elder's care, would not have dared to be so negligent!
Ultimately, she and Su Qishan could only blame themselves for not completely destroying all the evidence.
Now, it was too late.
The sliver of confidence Zhang Rufen had in the stealthy nature of the poison shattered instantly!
Zhou Yu!
It was Zhou Yu again!
Why was this troublemaker everywhere!
She realized once again that this young man named Zhou was her destined nemesis.
Ever since Zhou Yu appeared, Zhang Rufen had been unlucky in everything!
But the consequences this time were more severe than ever before!
"Don't you already know what it is?"
Looking at his elder brother beside him, Su Qichuan thought this to himself but ultimately held back.
He simply stared at Zhou Yu, hoping to hear the truth soon.
"Everyone should be aware of how strictly the authorities in Longguo regulate drugs. It's difficult to obtain most common poisons from any source. The fundamental difference between those poisons and the one Old Master Su has is that this is a refined substance that is colorless and odorless!"
Zhou Yu said this, picked up the water cup on the table, and poured some clean water into it.
He swirled the cup and then poured all the water onto the blanket with the medicinal stains.
After doing so, he turned his head to look at Su Qishan.
No.
To be precise, he was looking at Zhang Rufen, who was behind Su Qishan.
"Uncle Su, please step aside. The main character next is not you," Zhou Yu said with a smile.
Upon hearing this.
Su Qishan's expression changed.
But in the end, he moved aside.
At this point, he deemed it necessary to prepare for the worst.
"Why are you all looking at me? Zhou Yu! You... don't come closer!"
Zhang Rufen's eyes were filled with panic. She retreated continuously until she bumped into the wall of the room.
"Your reaction is very satisfactory, as it is the panic that a hidden poisoner would exhibit when about to be exposed," Zhou Yu said calmly.
Of course, he had no intention of doing anything strange to Zhang Rufen.
His advance was merely to break through her psychological defense.
The result was evident; Zhang Rufen's composure had completely crumbled.
"Su Qishan! Why are you standing so far away? Come here quickly and drive this brat away! Hurry, what are you waiting for?" Zhang Rufen, leaning against the wall, shouted at her husband.
But Su Qishan remained motionless.
Seeing this, Zhang Rufen froze.
The man who had promised to protect her was now acting like a stranger.
*Thud!*
Zhang Rufen slumped to the ground, her body devoid of strength.