I'm Seriously Ill, So Why Do I Want to Become an Immortal?

[Read with caution! Cthulhu | No cultivation levels | Insect Path's supreme grandmaster | Enlightenment-focused | Imperfect ending | Novel setting | No female lead | No System | No golden finger | The real world is rarely mentioned, with the story focused on another world. Battles of wits!]

What would you do if you were facing certain doom?

Marry Madam White Bone just to get your original wife back.

Experiment with an evil cultivator of the Insect Path just to hurt others without benefiting yourself.

Chat with a tin-can man just to dig up information and wait for an opportunity.

Neither trust the Snake Immortal, and stay up all night facing off against each other, just to bring both others and yourselves down at the same time.

Fight a water dragon, only to take a bath.

Drain a river of blood just to rinse your mouth.

Gods that cannot be killed, lifespans that never end. The demonic and immortal stage is yours, if you've got the guts to step onto it.