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

Synopsis

【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? "