Bound to the Death Immortal System, I'm Invincible

Bound to the Death Immortal System, I'm Invincible Plot:

Lin Xiaoan, the most invisible handyman in the Immortal Sect, accidentally triggers an ancient formation while scavenging at night and binds to the Death Immortal System—claimed to “turn mortals into immortals instantly.” But every use of its invincible skills requires him to experience the corresponding death agony: blocking a demon sword means feeling cold steel piercing his heart, resisting a thunder tribulation means enduring thousands of ants gnawing his bones. When demon cultivators storm the sect and crush his junior sister under ruins, Lin Xiaoan activates the system for the first time voluntarily—yet in his near-death moment, fragments of his past life flash: he was once the Death Immortal who died saving the sect, and this system was the soul-locking device he used to seal the demon soul! Now, the system gives an ultimate choice: survive with invincibility, or sacrifice his soul to destroy the demons like his past life?