Amalia Hana, after witnessing the injustice and hearing the racking cough of the old woman, seemed to forget everything around her. She furrowed her brow, her blue eyes reflecting a deep sorrow. "How awful for those two" she murmured, her voice filled with empathy. "The train isn't due for a long while... I must do something to help them."

With that, Amalia turned and darted off in the direction the grandmother and grandson had gone, leaving Rober standing stunned and bewildered. He watched Amalia's figure disappear into the crowd, then looked down at his own leather suitcase, and then at Amalia's elegant handbag lying abandoned on the ground.

"She... forgot her luggage?" Rober asked himself, unable to help but chuckle at Amalia's absentmindedness. A warm feeling spread through his heart. Though somewhat impulsive, Amalia was truly a kind and compassionate girl.

Rober sighed and picked up Amalia's bag. He didn't intend to chase after her immediately. Instead, he turned back to the apothecary shop and raised his hand to knock.

"Knock, knock, knock."

Heavy footsteps sounded from within, and then the wooden door creaked open. The apothecary, his face still etched with annoyance, asked gruffly "What is it now? I told you, I have no medicine to cure that old woman!"

Rober remained unfazed by the shop owner's rude demeanor. He replied in a calm, polite tone: "I'm not here to argue. I only wish to purchase a few herbs."

The shop owner narrowed his eyes at Rober, sizing him up. "Buy medicine? You need a doctor's prescription before I sell anything." He emphasized the point deliberately, as if to remind him of the previous incident.

Rober smiled, pulling a worn, yellowed card from his pocket. "I am a healer" he said, showing the card to the shop owner. "This is my certificate, issued by the church in my village."

The shop owner took the card and scrutinized it for a moment. Although the card was old and somewhat faded, the church seal was still quite clear. He sighed, reluctantly saying "Alright, what do you want to buy?"

"Two ounces of Windclear Leaf, two ounces of Moonbloom Flower" Rober replied, his voice clear.

The shop owner glanced at Rober, his eyes filled with a hint of suspicion. Windclear Leaf and Moonbloom Flower were common herbs, often used to treat respiratory ailments such as coughs and bronchitis. They were not rare or expensive remedies.

"What are you going to use those for?" the shop owner asked "They won't do anything for that old woman."

Rober knew what the shop owner was implying. "I know" he replied "but I still want to buy them. By the way, you seem to know a lot about the old woman's condition?"

The shop owner sighed and leaned against the doorframe. "I've known her for a long time" he said, his voice weary. "When she was young, she was very strong. But then... she found an abandoned child and had to feed another mouth. So she had to go work in the coal mine."

He paused, spitting on the ground. "That poisonous profession... Inhaling coal dust for a long time, your lungs will be ruined. She got black lung disease, the common ailment of miners."

"That kid" the shop owner continued "comes here every few weeks, demanding medicine for his grandmother. I've told him so many times, there's no cure for this disease. But he's stubborn, he won't listen. This time, I just gave him some phlegm-loosening medicine to get it over with. Who knew..."

Rober nodded, as if he understood. "Thank you for telling me" he said. "So, if you could get me two ounces of Windclear Leaf and two ounces of Moonbloom Flower."

The apothecary remained rooted in place, his eyes filled with suspicion, staring intensely at Rober, who still insisted on buying the herbs, even after hearing about the old woman's illness. "You... you truly know how to treat black lung?" He inquired, his tone holding a note of doubt, but also a flicker of hope.

Just as the question left his lips, a torrent of information flooded Rober's mind. The Sage System had activated, providing him with complete knowledge of black lung disease: from its causes, symptoms, and pathogenesis to its treatments, both traditional and modern methods.

Rober closed his eyes for a moment, organizing the newly acquired knowledge. When he opened them, he looked at the shop owner and replied with a confident voice:

"Now I do. And I'll also need one ounce of Earthsprite Root, and two restoration potions. Thank you for asking." He gave a confident smile."