Office worker Chen Yun dies suddenly and is reborn as a good-for-nothing cannon fodder character in a wish-fulfillment xianxia novel. From the start, a sect elder forces him to marry an unlucky junior sister said to bring death to her husbands, all to "bring good fortune."
Everyone else sees it as a death sentence, but Chen Yun just smiles. "KPI, right? I get it!"
"Elder, one isn't enough. I'm a helpful sort, so I'll take every 'problematic demoness,' 'ice-cold senior sister,' and 'yandere witch' in the sect who can't find a husband!"
He'd planned to cast a wide net to activate a System, but instead he unlocked the [Heaven-Defying Clan: More Children, More Blessings System]!
[Ding! You've successfully married your first wife (true identity: an amnesiac empress). Reward: Primordial Dao Body! Cultivation +1,000 years!]
[Ding! You've successfully married your second wife (true identity: a holy maiden of the demonic path). Reward: Supreme Demon Bone! The art Devouring Heaven Demonic Art!]
When the protagonists blessed by the original novel's fortune show up with marriage contracts and fortuitous encounters, they're left completely dumbfounded.
"Where's my childhood sweetheart?"
Chen Yun puts an arm around the beauty in his embrace and says calmly, "You mean my first wife? She's giving me a shoulder massage."
"Where's my betrothed, the Demon Venerable?"
"Oh, you mean my third wife? She's in the kitchen working on a new recipe."
"Where's the empress in my ring, my master?!"
"Sorry, that's my eighteenth wife. She's already carrying my child."