You said you would ascend to the immortal world, why did you end up in a mental hospital?

【Suspense + Fantasy + Madness + Confusion + Decisive Killing + No System】
In a cave.
"Disciple, do you want to become an immortal?"
Looking at the companion who was suspected to be used as a medicinal material...
"Master, I am willing."
"Okay, then you are my disciple, ranked 20th, Taoist name Ziwei!"
"Thank you Master for the Taoist name."
"Disciple eats immortal pills."
"Okay Master."
"Disciple, I will teach you how to move your Qi."
"Okay Master."
"Disciple, you are about to ascend, your senior brother is waiting for you above!"
"Okay Master...ah?"
The eyes went dark, and then brightened.
"Welcome to ascend, little junior brother!"
"Wait, senior brother, why are you wearing a mental illness suit?"