Chapter65

From the information Ya shared earlier, viewers could figure out what Jiang Che's psychiatric disorder was.
Paranoia.
This disorder is caused by various factors—biological, psychological, social environment—that mess with the brain's relatively stable functional state, resulting in abnormal cognition, emotion, and wilful behavior.
The severity and duration of these abnormalities go way beyond the normal range of mental fluctuation.
No one really knows what triggered Jiang Che, but all you need is to know what his mental obsession is.
In other words, Jiang Che is fine most of the time, communicates normally, but if you hit his mental fixation, he can be manipulated.
This is exactly how the hospital staff get psychiatric patients to listen:
A mix of coaxing and trickery—if all else fails, straight up force.
[Psych patients tend to be stubborn. This guy's basically a treasure trove in human form, totally screwed by this little nurse.]
[Feels like that nurse evil spirit did something with the clothes, tricking him into wearing them might be handing her a grenade.]
[Worrying about this, worrying about that, but if you don't wear it now, you might die instantly. At least with it, you get a bit more time.]
[If she leaves, where's this guy gonna find a wife?]
[Judging by his mental state, he'd probably charge at any evil spirit you point at and say it's his wife.]