Jiang Jingxue spent a long time diagnosing the problem, but still couldn't pinpoint what was wrong.

She talked to the patients, and they all said that their condition had suddenly worsened last night.

Jiang Jingxue was completely baffled; what exactly was going on?

How could everyone become seriously ill overnight?

Just then, Jiang Jingxue noticed an exception among the patients.

There was a boy who looked to be about twelve or thirteen years old, and he seemed to be in good spirits.

Jiang Jingxue squatted down and asked, "How are you feeling? Is anything bothering you?"

The boy shook his head: "No."

"Everyone suddenly has a stomachache in the middle of the night, but you didn't have that, right?"

The boy nodded: "Yes."

Jiang Jingxue was even more puzzled.

It's strange. Yesterday, everyone's situation was about the same, so why is it that today, everyone else's condition is more serious?

Only the little boy remained the same as before.

Jiang Jingxue chatted with the little boy for a few minutes, trying to find some clues.

Just then, the little boy said somewhat shyly, "Sister Jiang, yesterday..."

It was at this time that Jiang Jingxue found out.

It turns out that yesterday, the little boy drank several bowls of medicine and felt much better after Jiang Jingxue gave him acupuncture.

That evening, when the medicine arrived again, he found it too bitter and secretly threw it away.

In other words...

Everyone who took their medication last night experienced a worsening of their condition during the night.

However, he was perfectly fine because he didn't take the medicine.

"There must be something wrong with the medicine!"