I Found the Dog Disciple Who Had Used Me and Cast Me Aside

On the 6,721st day of my life as a useless wreck, I picked up the dog of an apprentice who'd seduced me and then abandoned me.

Versatile pairing, equally matched leads

Told in reverse chronological order

Transmigration into a book + System

Not an innocent, wholesome story

The seduction and abandonment were a lie, but the dog part is true

Theme: My dog apprentice and me