It was the height of the working day. The corridors of Teyvat Central Hospital were filled with the usual bustle. Doctors, nurses and other hospital staff milled about, while patients and their families strolled leisurely and had quiet conversations.

A neurosurgeon, Professor Neuvillette, stood at the head nurse's desk. He had a tablet in his hands and was carefully studying the medical history of one of the patients, not noticing the surrounding noise.

The young intern hurriedly walked up to the professor and handed him the glass of water that Neuvillette had asked him for earlier. Without looking in the intern's direction, the neurosurgeon took the glass and took a sip. The man's eyes widened slightly, and some kind of emotion appeared on his always stoic face, which could be interpreted as disgust.

“Excuse me, did you just pour tap water into a glass?” Neuvillette asked, there was genuine shock and bewilderment in his voice.