Su Qichuan spoke with conviction, but in the eyes of his elder brother, Su Qishan, it was anything but the case.
His brother's words were merely a cover for his and Old Master Su's true intentions.
Furthermore, if vows held any weight in this world, why would the number of divorcing couples increase daily?
Su Qishan never believed a person's vow.
After all, he himself didn't believe the promises he had once made.
"Easier said than done," he scoffed inwardly. To his face, however, he could only say, "Regardless, as long as you acknowledge me as the family head, I will overlook your past transgressions."
The situation was delicate. Otherwise, he would have thoroughly purged the household security team.
For now, he had to let it slide.
Su Qichuan offered no further rebuttal to his brother's distrust.
For the prejudice in people's hearts was like a mountain, and his brother's suspicion was difficult to change.
"Alas, why has our Su family come to this?"
Looking at his two sons, their brotherhood long shattered, Old Master Su could only sigh in despair.
It was too late to say anything now.
He could only blame himself for not noticing the situation earlier and nipping the budding animosity between his sons in the bud.
"Zhou Yu, as I said before, present facts and evidence. You claim Zhang Rufeng poisoned the Old Master, but you haven't produced any truly conclusive proof." Su Qishan stated.
Seeing his father’s stubborn refusal to repent, Su Yuyan could no longer sit still.
She stood up and questioned, "Dad, you keep emphasizing evidence. At this point, don't you feel any remorse?"
All arrows pointed to Zhang Rufeng. If anyone believed she and her husband, Su Qishan, were not complicit, who would believe them?
Even though Su Qishan was Su Yuyan's biological father, as his daughter, Su Yuyan refused to believe him!
A dying struggle!
Yes, in Su Yuyan's eyes, her father was like a drowning man refusing to give up.
"Yuyan! What nonsense are you spouting? I am your father, the head of this entire Su family! If I don't rely on facts and evidence, how can I possibly manage everyone in the family?" Su Qishan roared in anger.
Hearing this.
Su Yuyan said no more.
Since her father demanded proof, she would wait.
She just wondered if he would still speak like this when Zhou Yu presented the evidence before his eyes.
"Uncle Su, don't worry, I will present the evidence to you right away."
Zhou Yu watched as the medicine stains on the quilt soaked sufficiently. He picked it up and gave it a gentle squeeze, extracting a small cup of a mixture of darkish residue and water.
The stained part of the quilt, after being soaked in water, easily yielded some of the residual medicine.
"Bring me the medicine that Old Master Su has not yet drunk today," Zhou Yu instructed the servant at the door.
The servant nodded and, without hesitation, brought the medicine in.
Logically, Su Qishan was present, and he had no reason to obey Zhou Yu's instructions.
However, no matter what, this person was the young lady's husband.
Even if he followed the latter's instructions, there shouldn't be too much of an issue.
After the servant set down the decoction, Zhou Yu tasted a mouthful, then lightly sipped the mixture in the cup.
Closing his eyes.
Zhou Yu diligently recalled the various medicinal herbs his elder had once made him taste.
The decoction Old Master Su drank was composed of Chinese medicinal ingredients, and a simple analysis could reveal the answer.
Of course, this presupposed that the analyzer possessed a sufficient understanding of pharmacology and had tasted many kinds of Chinese medicinal herbs.
Otherwise, it would be impossible to discern.
"It's a miracle he could drink it."
Su Xingyang, watching the scene, muttered softly.
"Shut up! If you had half his skill, I would be relieved," Su Qichuan said, frustrated with his son.
His own son, naturally, could not compare to Zhou Yu.
But at roughly the same age, why was there such a vast difference?
Su Qichuan couldn't fathom the extent of Zhou Yu's education from childhood.
To be called a divine doctor at such a young age, to handle matters calmly and articulately, his temperament was even more formidable than that of many forty or fifty-year-olds.
He admitted to himself that Su Qichuan's temperament was no match for Zhou Yu's.
Su Xingyang, chastised by his father, immediately deflated and obediently shut his mouth.
Soon.
Zhou Yu opened his eyes.
"Zhou Yu, do you have a result?" Su Yuyan was the first to ask.
Su Qishan and Zhang Rufeng's gazes also turned towards him.
Zhou Yu smiled faintly, "A rare medicinal substance originating from the Western Regions. If I recall correctly, within our Dragon Country, it's called Jiangchen Grass."
"Jiangchen Grass? I've never heard of it?" Su Xingyang piped up again in a low voice.
Su Qichuan shot his son a glare.
In fact, let alone Su Xingyang, he, as his father, had never heard of Jiangchen Grass either.
Seeing the expressions on the faces of Su Qichuan and his son, Su Yuyan, Old Master Su, and others, Zhou Yu knew that none of them seemed to have heard of Jiangchen Grass.
However, this was not surprising.
"Jiangchen Grass is indeed produced in the Western Regions, and there, this herb is considered contraband, making it difficult to find on the market. As for our Dragon Country, the black market always sells it, but the price is outrageously high, hence very few people in the country know of this poisonous herb," Zhou Yu explained.
When he was a teenager, he had gone on a trip with his elder.
And during that mission, they had encountered this slow-acting poison.
"Based on your word alone, how can we believe you? Moreover, Zhou Yu, even if this medicine truly contains an extract of Jiangchen Grass, it still cannot be considered strong evidence." Su Qishan said coldly.
Despite his words.
In reality, his heart was already in a state of panic.
He had not expected that Zhou Yu, with just a small sip, could discern that the residual stain contained an extract of Jiangchen Grass!
In that instant, his doubts about Zhou Yu's title of divine doctor vanished completely.
However, the current situation was precisely what Su Qishan least wanted to see develop.
The more formidable Zhou Yu was, the greater the possibility of him disrupting his plans!
"Fortunately, fortunately, I made preparations in advance."
Thinking of the clever move he had secretly prepared, Su Qishan breathed a sigh of relief.
All he could do now was stall for time.
Meanwhile, Zhang Rufeng adopted an attitude of awaiting 'execution.'
She was acutely aware that nothing good awaited her next.
"This herb itself is not very toxic, almost negligible. However, its extract is a potent slow-acting poison. Once consumed long-term, a person's bodily functions will progressively deteriorate until they collapse and die."
At this point, Zhou Yu paused and continued, "When Old Master Su fell ill that time, he could have recovered and stood up again, but because of this slow-acting poison, he was unable to. Alas, after years of medication, the Old Master's body is now withered."
Jiangchen Grass, indeed possessed such medicinal properties.